A 23.02 gram sample of cobalt is heated in the presence of excess fluorine. A metal fluoride is formed with a mass of
37.87 g. Determine the empirical formula of the metal fluoride.
Empirical formula of the metal fluoride is CuF₂
Empirical formula is the simplest whole number ratio of atoms present in a compound
Here given data is
Mass of copper heated = 23.02 gram
Mass of copper fluoride formed = 37.87 g
We have to calculate gas in copper fluoride = x
37.87 g = 23.02 gram + x
x = 37.87 g - 23.02 gram
x = 14.85 g
Moles of copper
23.02 gram/63.546g/mol = 0.362 mol
Moles of Florine
14.85 g/18.998g/mol =0.781 mol
For the empirical formula divide the smallest mole of an element with all the moles of elements present in the compound
Copper = 0.362 mol/0.362 mol = 1
Florine =0.781 mol / 0.362 mol = 2.15
It means 1 : 2
So the empirical formula of the metal fluoride is CuF₂
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A straw rocket is launched with a net Force of 1.5 N. The straw rocket has a mass of 0.005 kg.
What is the acceleration of the rocket?
Answer:
300m/s2 because when devide 15000 to 150 it will be 300
Acceleration is the the ratio of the force to the mass. Thus acceleration of the rocket weighing 0.005 Kg launching with a force of 1.5 N is 300 m/s².
What is force?Force is an external agent acting on a body to change it from the state of rest or motion. There are various kinds of forces, such as nuclear force, magnetic force, frictional force, gravitational force etc.
According Newton's second law of motion, force is the product of mass and acceleration of the body. Thus force increases with an increase in mass.
Given that the mass of the rocket is 0.005 Kg and force exerted is 1.5 N. Acceleration can be find out as follows:
Acceleration = force / mass
= 1.5 N/ 0.005 Kg
= 300 m/s².
Therefore, acceleration of the rocket will be 300 m/s².
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What is the mass (in grams) of 25.00 L of propane vapor (C3H8) at
STP? R= 0.08314 L-bar/mol. K.
The mass in grams of 23.0 L of propane vapor at STP is 22.968 g, as calculated by the mole concept.
given data are:-moles = 23/44 = 0.522 moles
Since there are 0.522 moles in a 44 liter, the mass of 23 L of propane is equal to 44 x 0.522, or 22.968 g.
Therefore, 23 liters of propane contain 22.968 g of propane at STP.
what is mole concept?The definition of a mole is a measure of substance quantity. It is a unit of measurement used to determine how many elementary particles make up a specific substance.
It has a precise definition of 6.022 1023 elementary entities. Depending on the kind of substance, the elementary unit may be a molecule, atom, or ion. Avogadro's number is the quantity of elementary particles in a mole.
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Calculate the amount of carbon dioxide gas (in grams and liters) that could be formed when 10.0 g
sodium carbonate is completely decomposed at 50.°C and an atmospheric pressure of 750. torr.
Na₂CO3 —> Na₂O + CO₂
The decomposition reaction of sodium carbonate produces 0.094 moles and 2.5 L of carbon dioxide
What is the volume of the gas produced?We know that the decomposition of the one mole of sodium carbonate would produce one mole of carbon dioxide. Hence we need to apply the stoichiometry of the reaction in order to be able to solve the problem.
Number of moles of moles of sodium carbonate = 10g/106 g/mol
= 0.094 moles
Since one mole of sodium carbonate produces one mole of carbon dioxde then 0.094 moles was produced.
Given that;
Pressure = 750. torr or 0.99 atm
Volume = ?
Temperature = 50.°C + 273 = 323 K
Then;
PV = nRT
V =nRT/P
V = 0.094 moles * 0.082 * 323/0.99
= 2.5 L
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Potassium reacts violently with cold water. It forms an alkaline solution of potassium hydroxide and hydrogen.
potassium + water → potassium hydroxide + hydrogen
(a) In what physical state is hydrogen given off? Choose your answer from the words in the box.
gas liquid solid solution
Answer: Gas
Explanation:
When they mix, hydrogen gas is produced.
An excess of sodium carbonate, Na2CO3, in solution is added to a solution containing 17.15 g CaCl2. After performing the experiment, 14.17 g of calcium carbonate, CaCO3, is produced. Calculate the percent yield of this reaction.
The percent yield of the reaction would be 91.66%.
What is percent yield?The percent yield of a reaction is the actual yield from the reaction relative to the theoretical yield of the same reaction.
The percent yield of a reaction is mathematically expressed as follows:
percent yield = actual yield/theoretical yield x 100%
From the equation of the reaction:
[tex]Na_2CO_3 + CaCl_2 --- > CaCO_3 + 2NaCl[/tex]
The mole ratio of [tex]CaCl_2[/tex] to [tex]CaCO_3[/tex] according to the balanced equation is 1:1.
Recall that: mole = mass/molar mass
The molar mass of [tex]CaCl_2[/tex] is 110.98 g/mol
mole of 17.15 g [tex]CaCl_2[/tex] = 17.15/110.98
= 0.1545 mol
Equivalent mole of [tex]CaCO_3[/tex] = 0.1545 mol
Molar mass of [tex]CaCO_3[/tex] = 100.09 g/mol
Mass of 0.1545 mol [tex]CaCO_3[/tex] = 0.1545 x 100.09
= 15.46 g
Thus:
Theoretical yield = 15.46 g
Actual yield = 14.17 g
Percent yield = 14.17/15.46 x 100
= 91.66%
In other words, the percent yield of the reaction is 91.66%.
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a 10.0 g sample of Krypton has a temperature of 25 C at 572 mmhg. what is the volume in mililiter of the krypton gas
A 10.0 g sample of Krypton has a temperature of 25 C at 572 mmHg and volume in mililiter of the krypton gas is 375ml
An ideal gas is the thereotical gas that is considered to be composed of point particles that move randomly and do not interact with each other and h]gases in general are ideal when they are at high temprature and low pressure
Here given data is
Mass = 10.0 g
Temprature = 25 °C
Pressure = 572 mmHg
So formula is PV = nRT
V = nRT/P
So n = 10 gram × 1mole/83.80 gram = 0.119 mole
R = 0.082
T = 25 °C = 298K
P = 572 mmHg = 0.752632 atm
V = nRT/P
V = 0.119 mole×0.082×298K/0.752632 atm
V = 0.375 L = 375ml
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how do the specialized structures inside an animal cell with if function cell?
Specialized structures inside an animal cell function to provide particular functions to these types of cells.
What specialized structures are found in animal cells?Animal cells are unique in the sense they have a centrosome which is involved in the mechanism of cell division and also lysosome organelles that contain hydrolytic enzymes that degrade chemical compounds inside the cells.
Therefore, with this data, we can see that animal cells are unique because they are composed of unique structures such as the centrosomes used during the cell division and lysosomes used to degrade substances.
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What is the Nash equilibrium explain?
A player can obtain the desired outcome by sticking to their initial strategy, according to the Nash equilibrium, a decision-making theorem in game theory. Each player's approach in the Nash equilibrium is the best one given what the other players have decided.
A Nash equilibrium is a situation in which no participant would profit from altering their current course of action. This implies that even if a player were to know the plans of every opponent, they would still decide to stick with their original plan. Assuming that the other players maintain their initial plans, a player does not benefit from changing their approach under the Nash equilibrium. There could be several Nash equilibria in a game, or none at all. One of the fundamental ideas in game theory is Nash equilibrium.
Assign A the probability of playing H and (1p) of playing T, and B the probability of playing H and (1q) of playing T to calculate the mixed-strategy Nash equilibrium. In this game, the mixed-strategy Nash equilibrium is for each player to select H or T at random with p = 1/2 and q = 1/2.
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!!PLEASE, PLEASE, PLEASEE!!!
EXPLAIN IN DETAIL HOW THE TWO RELATES TO THE CELL THEORY
The following lists components of the nature of science. Explain how at least two of these are related to the cell theory:
Scientific knowledge is durable yet subject to change
Science is a social activity
The modern cell theory explains the relation between the cells and the living things.
The Scientific knowledge is durable yet subject to change. Science is a social activity. The scientific knowledge includes the generalized collection of the laws and the hypothesis. scientific knowledge is used to generate the logical data and the knowledge. scientific knowledge is used to investigate the data to explain the phenomena. scientific knowledge involves the experiments and the data collection. the scientific knowledge is very important because it helps us to understand ourselves and the world.
Thus, The modern cell theory explains the relation between the cells and the living things.
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How to manipulite a compound microscope?
Answer:
Remove the microscope from the cabinet USING both of your hands supporting the arm and the base.Place it on a flat surface.Turn the coarse adjustment knob to raise the body tube.Revolve the nosepiece.Put it on Low-power objective. ...Adjust the diaphragm.Adjust the mirror until there is good light.Explanation:
Thanks
Answer:
Explanation:
Look at the objective lens (3) and the stage from the side and turn the focus knob (4) so the stage moves upward. Move it up as far as it will go without letting the objective touch the coverslip. Look through the eyepiece (1) and move the focus knob until the image comes into focus.
Calculate the pH of a solution that has a hydronium ion concentration, [H3O+], [ H 3 O + ] , of 2.56×10−6 M.
The pH of a solution with a hydronium concentration of 2.56 x [tex]10^{-6[/tex] M would be 5.59.
What is pH?The pH of a substance is the degree of acidity or alkalinity of the substance. It is simply a measure of how acidic or basic the substance is.
The pH of any substance is mathematically expressed as:
pH = -log [tex][H^+][/tex]
where [tex][H^+][/tex] is the hydrogen ion concentration.
pH = 14 - pOH
Also,
pH = - log [tex][H_3O^+][/tex]
Where [tex][H_3O^+][/tex] is the hydronium ion concentration.
In this case, the hydronium ion concentration is given as 2.56 x [tex]10^{-6[/tex]M
Thus,
pH = -log 2.56 x [tex]10^{-6[/tex]
= 5.59
In other words, the pH of a solution that has a hydronium ion concentration of 2.56 x [tex]10^{-6[/tex] M is 5.59.
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A balloon is inflated to 4.50 L with nitrogen gas, N2, at a particular initial temperature and pressure, and tied-off. Assume that the temperatures and pressures referred to are always those prevailing inside the balloon.
To what volume will the balloon contract or expand when:
1. The pressure is reduced to one-half the initial value and the Kelvin temperature is reduced to one third of the initial value?
2. The pressure is reduced to one third of the initial value and the Kelvin temperature is doubled?
Temperature has an impact on the hot air balloon's internal pressure. The molecules move more quickly and forcefully against the interior wall of the balloon as they warm up.
How does the balloon's size change as the temperature drops?Because the average kinetic energy of the gas molecules in a balloon drops as temperature rises, the frozen balloon shrank. As a result, the molecules move more slowly and collide with the balloon's interior wall less frequently and weakly, causing the balloon to somewhat contract.
What will happen to the volume if the temperature rises and the pressure stays the same? Why?These illustrations show how temperature can change the volume of a fixed amount of a confined gas while maintaining a constant pressure are generally accurate: The volume rises with rising temperature and falls with falling temperature.
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The theoretical yield of a reaction is the amount of product obtained if the limiting reactant is completely
converted to product.
Consider the reaction:
H₂(g) + I₂(s) - 2 HI(g)
If 15.28 g H₂ is mixed with 18.82 g I₂, calculate the theoretical yield (g) of HI produced by the reaction.
The theoretical yield (g) of HI produced by the reaction is 18.93 g.
The reaction is given as :
H₂(g) + I₂(s) ----> 2 HI(g)
given that ;
mass of H₂ = 15.28 g
mass of I₂ = 18.82 g
moles of H₂ = mass / molar mass
= 15.28 / 2
= 7.64 mol
moles of I₂ = mass / molar mass
= 18.82 / 253.80
= 0.074 mol
therefore the I₂ is the limiting reactant. so, the amount of HI produced is depend upon the I₂.
1 mole of I₂ produce = 2 mole of HI
0.074 mole of I₂ = 2 × 0.074 = 0.148 mol of HI
Theoretical yield of HI = 0.148 × 127.91
= 18.93 g
Thus, The theoretical yield of a reaction is the amount of product obtained if the limiting reactant is completely converted to product. If 15.28 g H₂ is mixed with 18.82 g I₂, the theoretical yield (g) of HI produced by the reaction is 18.93 g.
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Can anyone please explain to me how that works?
Answer:
Explanation:
Have you done any Lewis diagrams? your picture of the drawings are kind like a Lewis diagram, showing the electrons filling of the outer shell. The outer shell balancing is what holds the atoms together in molecules. That's what you are showing in your drawing. How the atoms "stick" together.
The dew point for a day's weather is calculated to be 18°C.
Which statement is true based on the dew point?
O Water will condense if the air temperature drops below 18°C.
O Dew is unlikely to form on the ground if the temperature is below 18°C.
OIt is likely to rain if the temperature rises above 18°C.
O Water in the air will remain vapor below 18°C.
The dew point for a day's weather is calculated to be 18°C, Water will condense if the air temperature drops below 18°C.
What is weather?
Weather refers to the state of a atmosphere and includes terms like how hot or cold, wet as well as dry, calm as well as stormy, clear or cloudy, etc. On Earth, the majority of weather events take place in the troposphere, which is the lowest part of the planet's atmosphere and lies just below the stratosphere. Climate is indeed the term again for averaging of atmospheric conditions over a longer period of time, whereas weather is the term for day-to-day temperature, precipitation, as well as other atmospheric conditions. Without further explanation, "weather" is typically taken to refer to the weather on Earth. Differences in air pressure, temperature, as well as moisture from one location to another influence the weather. The Sun's angle at any given location, which changes with latitude, may be the cause of these variations.
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The molar mass of Si is 28.09 g/mol.
How many atoms are in 112 g of Si?
Answer: 2.40 X10^24
Explanation: Utilizing Avogadro's Number of 6.022 X 10^23
112gSi X 1molSi/28.09gSi X 6.022 X 10^23/1molSi = 2.40 X 10^23
An electric immersion heater is put at the bottom of a large tank of water.
The water next to the heater becomes warm.
(i)
What will happen to the warmed water next to the heater?
Give a reason for your answer.
An electric immersion heater is put at the bottom of a large tank of water the water next to the heater becomes warm then warmed water next to the heater energy will travel up from the heater through the particles
The water is heated up from the inside and usually with electricity a strong electric current run through a large element inside the tank to directly heat the water around it and energy will travel up from the heater through the particles and making them faster and further apart and meaning they become less dense and when water is heated with immersion heater the water become less dense due to which the warm water rises up and the cooler water fill its space
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(need answer) energy passes heat from one object to another?
Answer:
What is the question?
Explanation:
The X-rat on the right is pointing out an area on the back and bottom of tuts skull
Based on the x-ray, the thing that could have caused the injury in both of these images is that the wounds and cave-in of the broken bone can point to blunt force trauma, which may have resulted from a fall and hitting his head or from an animal striking him in the head.
What could have damaged King Tut's head, and how?It gave precise information necessary for a precise forensic reconstruction of King Tut. The 1,700 digitized X-ray images in cross section created by the CT scan showed the mummy from head to toe. It displayed a gray head, neck vertebrae, a hand, numerous pictures of rib cages, and a skull cut in half.
Note that researchers published its findings, concluding that the corpse's head was likely broken either during embalming or during research by archeologist Howard Carter's team, which found the mummy in 1922.
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See full question below
The x-ray on the right is pointing out an area on the back and bottom of Tut's skull. The large white part is Tut's skull. Notice the smaller white part that the arrow is pointing to. The separation between these two white areas indicate an injury to Tut's skull. What could have caused the injury in both of these images?
A sample of gas has a volume of 2.50 L at 536 kPa and 75.0 °C. What is the pressure (in atm) of the gas if it expands to 3.75 L at 25.0 °C?
How do i start this?
Answer:
3.02 atm
Explanation:
To find the final pressure, you need to use the Combined Gas Law:
[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]
In this equation, "P₁", "V₁", and "T₁" represent the initial pressure, volume, and temperature. "P₂", "V₂", and "T₂" represent the final pressure, volume, and temperature. You first need to convert the temperatures from Celsius to Kelvin (1°C = 273 K). You should convert the initial pressure from kPa to atm (1 atm = 101.3 kPa).
P₁ = 536 kPa / 101.3kPa = 5.29 atm P₂ = ? atm
V₁ = 2.50 L V₂ = 3.75 L
T₁ = 75.0 °C + 273 = 348 K T₂ = 25.0°C + 273 = 298 K
[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex] <----- Combined Gas Law
[tex]\frac{(5.29atm)(2.50L)}{348K}=\frac{P_2(3.75L)}{298K}[/tex] <----- Insert values
[tex]0.0380=\frac{P_2(3.75L)}{298K}[/tex] <----- Simplify left side
[tex]11.32 = P_2(3.75L)[/tex] <----- Multiply both sides by 298 K
[tex]3.02 = P_2[/tex] <----- Divide both sides by 3.75 L
What sentence describes energy?
a) The pressure is the same at both stages, even though more air particles
have been added to the balloon. Explain why, using the particle model.
The pressure is the same at both stages, even though more air particles have been added to the balloon. This is due to chnge in the intermolecular distance between two consecutive particles.
What is Particle Model?The particle model is one of the scientific theory which explains us the properties of solids, liquids and gases by suggests about that the matter is made of particles, and those particles behaves differently in gases, liquids and solids.
This can be expained as early the particles are less but volume it contain remains same when particles are added in the balloon.
This is due to the reason that the intermolecular distance between two successive particles decreases when particles are added to it.
Thus, we concluded that the pressure is the same at both stages, even though more air particles have been added to the balloon. This is due to chnge in the intermolecular distance between two consecutive particles.
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identify the element that has the following electron configuration
The element that has the following electronic configuration are :
seleniumbrominekrypton franciuma) the atomic number of selenium is 34. the electronic configuration is given as :
electronic configuration : 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁴
b) the atomic number of bromine is 35 . the electronic configuration is given as :
electronic configuration : 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁵
c) the atomic number of krypton is 36 . the electronic configuration is given as :
electronic configuration : 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶
d) the atomic number of francium is 87. the electronic configuration is given as :
electronic configuration : 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 4d¹⁰ 5s² 5p⁶ 4f¹⁴ 5d¹⁰ 6p⁶ 7s¹
Thus, The element that has the following electronic configuration are :
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The gravity battery is similar to an but it doesn’t carry people
Answer:i try and try but nobody likes me
Explanation: that's the story of the day lucky person brainiest pls
hehehhehehhehehehehehhehhehehehehehehehehehehe
TiCl4 + O2
What is the predicted product
Answer: Titanium dioxide
Compare the strength of HCN (Ka = 4.9×10^-10) with 0.01M aqueous solution of formic acid in which it is 14.5% dissociated.
[tex]{ \boxed{ \purple{ \tt{6.5 \times {10}^{2} }}}}[/tex]
Explanation:-
Applying,
[tex]{ \blue{ \tt{ \frac{Strength \: of \: formic \: acid}{Strength \: of \: HCN}} \: = }} \: \: \: { \green{ \tt{ \sqrt{ \frac{K _{a}(formic \: acid)}{K _{a}(HCN)} }}}}[/tex]
Degree of dissociation of HCOOH [tex] { \red{ \sf{( \alpha) = 14.5\%}}}[/tex][tex]{ = \red{ \sf{ \frac{14.5}{100}}}} [/tex][tex]{ = \red{ \sf{0.145}}}[/tex]
[tex]{ \purple{ \tt{ K_{a}(HCOOH) = C { \alpha }^{2}}}} [/tex]
[tex]{ \purple{ \tt{ K_{a}(HCOOH) = 0.01 \times {(0.145)}^{2} }}}[/tex]
[tex]{ \purple{ \tt{ K_{a}(HCOOH) = 2.1 \times {10}^{ - 4}}}} [/tex]
Thus,
[tex]{ \blue{ \tt{ \frac{Strength \: of \: formic \: acid}{Strength \: of \: HCN}} \: = }}{ \green{ \tt{ \sqrt{ \frac{2.1 \times {10}^{ - 4} }{4.9 \times {10}^{ - 10} } }}}}[/tex]
[tex]{ = \boxed{ { \red{ \sf{6.5 \times {10}^{2}}}}}} [/tex]
i.e., formic acid is 6.5×10² times stronger than HCN or we can say that HCN is 6.5×10² times weaker than formic acid.
. Calculate the number of moles in 5.00 × 102 g of each substance. How many molecules or formula units are present in each sample?
a. CaO (lime)
b. CaCO3(chalk)
c. C12H22O11 [sucrose (cane sugar)]
d. NaOCl (bleach)
e. CO2 (dry ice)
The number of moles in 500g of CaO, CaCO₃, C₁₂H₂₂O₁₁, NaOCl, and CO₂ are 8.93, 5, 1.46, 6.71 and 11.36 moles.
What is a mole?A mole is a scientific unit that is used to determine the number of atoms, molecules, ions, etc. The number of entities in 1 mole was found 6.023 × 10 ²³ per mole which is known as Avogadro’s constant.
a) Given, the mass of each substance = 5 ×10² g
The molar mass of CaO = 56 g
The number of moles in 5 ×10² g of CaO = 500/56 = 8.93 moles
The number of molecules in 8.90 moles of CaO = 8.93× 6.023 × 10 ²³
= 53.77 ×10²⁴ formula unit
b) The molar mass of CaCO₃ = 100 g
The number of moles in 5 ×10² g of CaCO₃ = 500/100 = 5 moles
The number of molecules in 5 moles of CaO = 5× 6.023 × 10 ²³
= 3.0 ×10²⁴ formula unit
c) The molar mass of C₁₂H₂₂O₁₁ = 342.3 g/mol
The number of moles in 5 ×10² g of C₁₂H₂₂O₁₁ = 500/342.3 = 1.46 moles
Number of molecules in 8.90 moles of C₁₂H₂₂O₁₁ = 1.46 × 6.023 × 10 ²³
= 8.8 × 10 ²³
d) The molar mass of NaOCl = 74.5 g/mol
The number of moles in 5 ×10² g of NaOCl = 500/74.5 = 6.71 moles
The number of molecules in 8.90 moles of CO₂ = 6.71× 6.023 × 10 ²³
= 4.04 ×10²⁴
e) The molar mass of CO₂ = 44 g/mol
The number of moles in 5 ×10² g of CO₂ = 500/44 = 11.36 moles
The number of molecules in 8.90 moles of CO₂ = 11.36× 6.023 × 10 ²³
= 6.84 ×10²⁴
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Patrick is a 16 year old boy whose body has stopped producing osteoclasts. What does this mean for his bones? What other parts of his body will be affected by this?
A 345. g sample of an unknown substance was heated from 45.0°C to 167.7°C. In the process, the substance absorbed
18.942 kJ of energy. What is the specific heat of the substance? Give your answer in both standard and scientific notation.
Was this an endothermic or exothermic process? Identify the substance based on the table below.
The specific heat of the given substance is equal to 0.447 J/g°C. As the energy is absorbed by the substance therefore it is an endothermic process. From the given table the substance can be iron.
What is the specific heat capacity?The specific heat capacity of a material can be defined as the quantity of heat required to raise the temperature in one unit of material by one-degree Celcius.
When the heat is lost or absorbed, the temperature of the material will be changed following the equation:
Q = mCΔT
Given, the amount of energy absorbed, Q = 18.942 KJ
The mass of the substance, m = 345 g
The change in the temperature = 167.7 - 45 = 122.7°C
The specific heat for the given substance can be determined as:
18.942 × 1000 = 345 × C × 122.7
C = 0.447 J/g°C
Therefore, the specific heat of the substance is equal to 0.447 J/g°C.
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