Answer:
339 grams Rb
Explanation:
To find the final answer, you need to (1) convert atoms to moles (via Avogadro's number) and then (2) convert moles to grams (via molar mass from periodic table).
Molar Mass (Rb) = 85.468 g/mol
2.39 x 10²⁴ atoms Rb 1 mole 85.468 g
------------------------------- x ----------------------------- x -------------------- = 339 g Rb
6.022 x 10²³ atoms 1 mole
Which statement about compounds and molecules is correct?
O All compounds are molecules.
O All molecules are compounds.
O Compounds are composed of molecules bonded together.
O Molecules are composed of compounds bonded together.
Answer: Compounds are composed of molecules bonded together.
The statement about compounds and molecules is correct is compounds are composed of molecules bonded together. Therefore, option C is correct.
What are compound ?The term compound is defined as a substance made from two or more different elements that have been chemically attached. Water, carbon dioxide and table salt are some examples of compounds.
A compound is form when two or more atoms form a chemical bond that links them together. As we know, there are two types of bonds are present that are ionic bonds and covalent bonds.
In an ionic bond, the atoms are linked together by the electrostatic forces of the attraction between ions of opposite charge. So,compounds are composed of molecules bonded together.
Thus, option C is correct.
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name the three crystalline forms of carbon
Answer:
Diamond.
Graphite.
Fullerene
Explanation:
these are three crystalline forms of carbon.
Using the chemical formula CaO + 2 NaCl → Na2O + CaCl2, calculate how many moles of CaCl2 you would produce if you used up 5.4 moles of CaO?
Answer:
5.4 moles CaO 1 mole CaCl₂ 5.4 mole CaCl₂
1 mole CaO
Explanation:
the answer to 54.34g-45.6g has how many significant figures
A 150.0 mg block at 22.5⁰C has a volume of 5,382 cm³.
Which answer choice represents BOTH the correct temperature of the block in Kelvin AND the correct density of the block in g/cm³?
72.5 ⁰K; 2.78 x 10⁻⁵ g/cm³
296 ⁰K; 3.59 x 10⁴ g/cm³
-250 ⁰K; 3.59 x 10⁻⁴ g/cm³
296 ⁰K; 2.78 x 10⁻⁵ g/cm³
Density is the ratio of mass and volume. The temperature in kelvin is 296 kelvin and the density of the block is 2.78 x 10⁻⁵ g/cm³. Thus, option D is correct.
What is density?Density is the gms of the substance present in a cubic centimeter of volume. It is calculated in g/ cm³.
Given,
Mass of the block = 150.0 mg
Volume = 5382 cm³
Density is calculated as:
D = Mass ÷ volume
= 0.15 gm ÷ 5382 cm³
= 2.78 × 10⁻⁵ gm/ cm³
Temperature from Celsius to kelvin is converted as:
0°C + 273.15 = 273.15K
22.5 + 273.15 = 295.65 Kelvin
Therefore, option D. 296⁰K; 2.78 x 10⁻⁵ g/cm³ is correct.
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4. Which of the following involves the largest consumption of fresh water resources?
a. Recreational purposes by humans
b. Agricultural processes
c. Drinking purposes by humans
d. Industrial processes
These three gases, Helium, Neon, and Argon all have one property in common because they are gases at room temperature. That is they:
They have no definite shape and no definite volume because they are gases.
How gases have no definite and volume?Gases have no definite shape and no definite volume because they are present in free state. Those substances that are close together and held tightly have definite shape and volume.
So we can conclude that they have no definite shape and no definite volume because they are gases.
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how many molecules are in 85.4 grams of Li2SO4
Answer:
85.4
Explanation:
2KCIO3 -> 2KCI + 302
For the reaction shown here, calculate how many moles of reactants are needed to produce 96 grams of oxygen gas as a product.
A) 1
B) 2
C) 3
D) 4
Moles of oxygen
Given mass/molar mass96/323mol2 mol reactants required for 3mol O_2
So our answer is 2
How is light used in our daily activities?
Answer:
that is your answer hope this helps u
Determine the molarity of a solution with a volume of 437. mL and 0.590 mol of
solute dissolved.
Answer:
Answer:
= 1.35M
Explanation:
data:
volume = 437ml
= 437 /1000
= 0.437dm^3
no. of moles = 0.590 moles
solution:
molarity = [tex]\frac{no. of moles}{volume in dm^3}[/tex]
= 0.590 / 0.437
molarity = 1.35M
HBr + H,SO, - SO, + Br, + H,O
Did S change oxidation number?
Answer:
I think the answer might be yes..
PLEASE HURRY What is one technology that has contributed to human population growth in the past that could hinder it in the future? How will this happen?
Answer:
Factories because they have helped with producing goods faster but in the meanwhile, our future will slowly get warmer.
Explanation:
Calculate the mass in grams of NaCl required to prepare 0.500 L of a 0.500 M solution.
Answer:
14.61 g NaCl
Explanation:
Molarity = moles / volume of solution (litres)
0.500 = moles / 0.500 L
moles = 0.25
Molar mass of NaCl is 58.44 g NaCl /1 mol NaCl.
0.25 moles NaCl x 58.44 g NaCl /1 mol NaCl
= 14.61 g NaCl
# 19 of precipitation
The value of Ksp for calcium sulfate is 2.4 x 10-5.
A solution of calcium sulfate with a concentration of 2.0 x 10-2 mol L-¹ is
Select one:
O a. undersaturated and precipitation of solid calcium sulfate will occur.
O b. of unknown saturation so prediction is not possible.
O c. undersaturated and precipitation of solid calcium sulfate will not occur.
O d. supersaturated and precipitation of solid calcium sulfate will occur.
supersaturated and precipitation of solid calcium sulfate will not occur.
e.
The solution is undersaturated and precipitation of solid calcium sulfate will not occur.
What is Ksp?Ksp stands for solubility product constant. The solubility product constant, Ksp, is the equilibrium constant for a solid substance dissolving in an aqueous solution.
From the given information, the solubility product constant of calcium sulfate is smaller than the concentration of its solution, thus, the solution is undersaturated and precipitation of solid calcium sulfate will not occur.
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what is the number of moles in 71g H20
The number of moles in 72 gram H₂O is 3.942 MOL.
What are moles?The mole is a SI unit of measurement that is used to calculate the quantity of any substance.
First, know the molar mass of water.
The given mass is 71 gram
[tex]\rm Number\;of \;moles= \dfrac{mass}{molar\;mass}\\\\\rm Number\;of \;moles= \dfrac{71}{18.01}= 3.942 mol[/tex]
Thus, the number of moles in 72 gram H₂O is 3.942 MOL.
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A 1.5 kg rock and a 15 kg book are dropped from rest from the same
height at the same time. In the absence of air resistance, which one will
hit the ground first?
2. An industrial process wastewater contains a mixture of metal fragments and sand. The metal fragments range in diameter from 0.5 to 10 mm with a specific gravity of 1.65. The sand particles range in diameter from 0.04 to 2.0 mm with a specific gravity of 2.65. The wastewater discharge rate is 1400 m3/d at 20°C. Design a settling tank to remove all the metal and sand particles. If the depth of the tank is 2 m, calculate the detention time. Solution Given
The detection time when an industrial process wastewater contains a mixture of metal fragments and sand is 1392.8 seconds.
How to calculate the detection time?From the information regarding the industrial process wastewater, the settling velocity for the sand particles will be:
= 9.81/[18(1.002 × 10^-6] × (2.65 - 1) × (0.04 × 10^-³)²
= 0.001435
Therefore, the detection time will be:
t = 2/0.001435
t = 1392.8 seconds.
The detection time is 1392.8 seconds.
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Stages of elution and regeneration
The resin may be regenerated by washing it again with water and making it safe for use again.
What is elution and regeneration ?Elution and regeneration are important processes in the treatment of water. The waste water is eluted through an ion exchange resin in which exchange of ions takes place.
The resin may be regenerated by washing it again with water and making it safe for use again.
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What is the ionic equation of a neutrilisation reaction?
Answer:
A salt is a neutral ionic compound. Let's see how a neutralization reaction produces both water and a salt, using as an example the reaction between solutions of hydrochloric acid and sodium hydroxide. The overall equation for this reaction is: NaOH + HCI → H2O and NaCl.
Explanation:
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[tex]\\ \orange{MaggieEve}[/tex]
Question 8 (1 point)
A lead sinker is used in fishing to weight a fishing line down. If 149.4 J of heat energy
J
was added to a lead sinker with a mass of 50 g. What is the total temperature change
for the lead sinker? Assume the specific heat (c) of lead is 0.129 J/gºC.
888
Answer:
do u like fishing
Explanation:
because i do
Answer:
23.2 C
Explanation:
By looking at the dimension of specific heat ( J/g-C) , you can compute these type of questions:
149.4 J / ( .129 J / g-C * 50 g) = 23.2 C
(see how dimensions g and J cancel out and you are left with C ? )
kilometre is a multiple of metre why
Which reason explains why the boiling point of water (H2O) is higher than the boiling point of hydrogen sulfide(H2S)
Options:
Ionic bonding
Covalent bonding
Hydrogen bonding
London dispersion forced
Which natural hazard is least likely to affect Florida?
drought
wildfire
rip current
tsunami
Answer:
A rip current is least likely to affect Florida.
Explanation:
Since Florida is surrounded by bodies of water it would make sense for Tsunamis to occur frequently. Florida is also known to have drought problems and sometimes also wildfires. A rip current would probably affect Florida the least as it is also the least dangerous to society.
Answer:
tsunami
Explanation:
Hydrazine (N₂H₄), a rocket fuel, reacts with oxygen to form nitrogen gas and water vapor. The reaction is represented with the equation:
N₂H₄(I) + O₂(g) --->N₂(g) + 2H₂O(g)
At STP, if 4.20L of O₂ reacts with N₂H₄, how many liters of water vapor will be produced?
At STP one mol weighs 22.4L
Moles of O_2
4.2/22.42.1/11.20.19mol1 mol.O_2 can create 2mol water
moles of water
2(0.19)0.38molVolume of water
0.38(22.4)8.512LAnswer:
The given equation is:
N2H4(l) + O2(g) → N2(g) + 2H2O(g)
From the periodic table:
mass of nitrogen = 14 gramsmass of hydrogen = 1 grammass of oxygen = 16 gramsTherefore:
molar mass of N2H4 = 2(14) + 4(1) = 32 grams
mass of water = 2(1) + 16 = 18 grams
From the balanced equation:
1 moles of N2H4 produces 2 moles of H2O.
32 grams of N2H4 produce 18*2=36 grams of water
To know the mass of N2H4 needed to produce 96 grams of water, all you need to do is cross multiplication as follows:
mass of N2H4 = (96*32) / 36 = 85.3334 grams1. Which substance dissolves in water to give a solution with a pH greater
than 7?
A Sulphur dioxide
B Sodium oxide
С Sodium chloride
D Carbon dioxide
Answer: sulphur dioxide
Explanation:
How many grams sodium bromide can be formed from 51 grams of sodium hydroxide?
Explanation:
When working with moles only, you will start by applying stoichiometry to determine how the reactants will affect your amount of products in this reaction. For this question, we will assume that other reactants are in infinite qualities, so therefore, it is the amount of aluminum that we will be concerned with. You need to figure out how much aluminum is in the specified amount of aluminum bromide, and then how much aluminum hydroxide that will be able to create. Make sure all your units cancel out!
9.24 mol AlBr3 x (1 mol Al / 1 mol AlBr3) x (1 mol Al(OH)3 / 1 mol Al) = 9.24 mol AlBr3
When you're working with mole ratios that involve grams to moles conversions, the first thing you want to do is calculate the molecular weight of each component you are being asked about. Because the question was given to you as words instead of chemical formulas, you will want to figure out the chemical formulas. For example, aluminum hydroxide is Al(OH)3 and aluminum bromide is AlBr3. To calculate molecular weight, you will want to consult a periodic table, find the molecular weight for each atom, and then calculate the correct sum of each molecular weight. Make sure you keep track of the number of each atom you have, i.e. 3 oxygen and 3 hydrogen for aluminum hydroxide.
Na = 22.990 g/mol
O = 15.999 g/mol
H = 1.008 g/mol
NaOH = 22.990 g/mol + 15.999 g/mol + 1.008 g/mol = 39.997 g/mol
Al = 26.982 g/mol
O = 15.999 g/mol
H = 1.008 g/mol
Al(OH)3 = 26.982 g/mol + (3 x 15.999 g/mol) + (3 x 1.008 g/mol) = 78.003 g/mol
Now, if you begin with an amount of NaOH in grams, you will first have to convert that to moles in order to use the mole ratio.
24 g NaOH x (1 mol NaOH / 39.997 g NaOH) = 0.600 mol NaOH
Now, you will have to account for the part of the sodium hydroxide that will be present in the aluminum hydroxide. In this case, it is the hydroxide (OH) portion of the formula. There is one mole of OH in each mole of NaOH, but there are 3 moles of OH in each mole of Al(OH)3. You will start with the 0.600 mol NaOH you know you have and then use the mole ratio.
0.600 mol NaOH x (1 mol OH / 1 mol NaOH) x (1 mol Al(OH)3 / 3 mol OH) = 0.200 mol Al(OH)3
Finally, when you are converting from grams to grams, you will have to find the molecular weight of both the reactant and the product, convert reactants in grams to reactants in moles, then use the mole ratio, then convert the moles of product back to grams of product. This time, you are concerned about the mole ratio of sodium, as that is the element that is in both chemical formulas.
Which statement correctly describes 1 mole of iodine (I₂)
A) its mass is 126.9g
B) its mass is 380.7 g
C) it contains 6.02*10^23 atoms
D)it contains 6.02*10^23 molecules
Answer:
It contains 6.02*10^23 molecules
Explanation:
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does vitamin b1 contain chemicals or a chemical reaction
When a fuel is burned, energy is released. Where do you think that energy comes from?
The energy comes from the sun, captured through photosynthesis.