elenium dichloride, SeCl2, has a molar mass of 149.86 g/mol. What is the mass in grams of 0.195 moles of SeCl2? Use the common abbreviation for the units.
Selenium chloride has a molar mass of 149.86 g/mol. The mass of selenium dichloride in grams is 29.22 grams.
What is mass?
Mass is the quantity of matter of a physical body.
The molar mass is given 149.86 g/mol
The number of moles is 0.195
By the formula of molar mass
[tex]\rm Molar\;mass = \dfrac{mass}{number\;of\;moles} \\\\\rm mass = molar mass \times number\;of\;moles\\\rm mass =149.86 \times 0.195 = 29.22 g[/tex]
Thus, the mass of selenium dichloride in grams is 29.22 grams.
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How many grams of chlorine atoms are present in a 3.45 g sample of barium chloride (BaCl2)?
Grams are the unit of measurement of the mass or the weight of the substance. There are 1.17 gms of chlorine atoms in the sample.
What is mass?The mass of the substance is the multiplication of the moles and the molar mass.
Barium chloride dissociates as:
BaCl₂ ⇄ Ba²⁺ + 2 Cl⁻
From the reaction, it can be said that 1 mole of barium chloride dissociates into 1-mole barium ion and 2 moles of chloride ions.
Moles of barium chloride are calculated as:
Moles = mass ÷ molar mass
= 3.45 gm ÷ 208.23 g/mol
= 0.016 moles
If 1 mole of Barium chloride has 2 moles then 0.016 moles of the sample will have, 0.0331 moles of chloride ions.
The mass of chlorine atoms is calculated as:
Mass = moles × molar mass
= 0.0331 × 35.45
= 1.17 gms
Therefore, 1.17 gms of chlorine atoms are present in barium chloride.
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Chloroquine is used to treat malaria. Studies have shown that one dose for a 12 kg child is 3.5 mg/kg of body weight and that 4 doses should be taken per day. How many milligrams of this drug should be given in one day?
Round your answer to the correct number of sig figs.
Answer: 100 milligrams per dose
10 mg per kg. The drug of ten kilos so you do
10 mg * 10 kg = 100 mg per dose
Explanation:
What is the nuclear composition of uranium-235?
92 electrons + 143 protons
92 protons + 143 electrons
O 143 protons + 92 neutrons
O 92 protons + 143 neutrons
♡
Answer:
The nuclear composition of uranium-235 is 92 protons and 143 neutrons.
What is ester?
help me pleaseee
Answer:
an organic compound made by replacing the hydrogen of an acid by an alkyl or other organic group. Many naturally occurring fats and essential oils are esters of fatty acids
Explanation:
ester, any of a class of organic compounds that react with water to produce alcohols and organic or inorganic acids. Esters derived from carboxylic acids are the most common. The term ester was introduced in the first half of the 19th century by German chemist Leopold Gmelin
Which of the following describes how air resistance affects the motion of a falling object?(1 point) Air resistance may change the direction of a falling object but does not affect its speed. Air resistance may change the direction of a falling object but does not affect its speed. Air resistance opposes the force of gravity and causes falling objects to lose speed once they reach terminal velocity. Air resistance opposes the force of gravity and causes falling objects to lose speed once they reach terminal velocity. Air resistance opposes the force of gravity and causes an object to reach terminal velocity. Air resistance opposes the force of gravity and causes an object to reach terminal velocity. Air resistance works with gravity to pull a falling object towards the Earth. Air resistance works with gravity to pull a falling object towards the Earth.
Answer:
Air resistance opposes the gravity in a falling object hence the object loses speed once it reaches terminal velocity.
According to the experim
Find the formula for the hydrate
0.737 g MgSO3 and 0.763 g H2O
The required formula of hydrate is MgSO₃.6H₂O.
How do we calculate the formula of hydrate?The number of moles of water per mole of anhydrous solid (x) will be computed by dividing the number of moles of water by the number of moles of anhydrous solid (x) to find the hydrate's formula.
Moles will be calculated as:
n = W/M, where
Moles of MgSO₃ = 0.737g / 104.3g/mol = 0.007mol
Moles of H₂O = 0.763g / 18g/mol = 0.04 mol
Number of H₂O molecule = 0.04/0.007 = 5.7 = 6
So formula of hydrate is MgSO₃.6H₂O.
Hence required formula of hydrate compound is MgSO₃.6H₂O.
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What is the percent composition of Cesium and Fluorine in CsF?
The percent composition of Cesium and Fluorine in CsF are 87.493 % and 12.507 % respectively.
What is a percentage composition?Percent composition is very simple. Percent composition tells you by mass what percent of each element is present in a compound.
Molecular mass of Cs = 132.9054519
Molecular mass of F = 18.9984032
Molecular mass of CsF = 132.9054519 + 18.9984032 = 151.9038551
CsF: Percent composition by element:
Cesium (Cs) = [tex]\frac{32.9054519 X 100}{151.9038551}[/tex] = 87.493 %
Fluorine (F) = [tex]\frac{18.9984032 X 100 }{151.9038551}[/tex]= 12.507 %
Hence, the percent composition of Cesium and Fluorine in CsF are 87.493 % and 12.507 % respectively.
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# 1083 of LethalDose
Concentrated hydrochloric acid is 38%, by mass, HCI in water. How
many grams of HCI are there in 25.0 g concentrated hydrochloric acid?
Select one:
O a. 38.0 g
O b.
25.0 g
O c. 16.5 g
O d. 12.0 g
O e. 9.50 g
The amount, in grams, of HCl that are in 25.0 grams of concentrated hydrochloric acid will be 9.5 grams
Percentage contentEvery concentrated HCl contains 38% HCl by mass. This means that 38 grams of HCl would be in every 100 grams of concentrated HCl.
There, for 25.0 grams concentrated HCl, the amount of HCl can be calculated as:
38/100 x 25.0 = 9.5 grams
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C. Uprooted plants dry and die. Why?
Because:
Their roots are no longer in the soil. Thus, can't absorb water and mineral ions needed for plant growth via photosynthesis.
Hope this helps!
Answer:
Yes
Explanation:
Well this is because when a plant is planted water goes from the soil, into the roots then finally distributed to other parts of the plant.
So when plants have been plucked or uprooted water no longer has access to the plant which may result to the plant being dried up and will possibly die
please assist with answering the attached assignment
For first order plot of ln( [tex]P_{SO_{2}Cl_{2}}[/tex]) vs time will be a straight line, which shows first order reaction
What is First Order Reaction ?
A first-order reaction can be defined as a chemical reaction in which the reaction rate is linearly dependent on the concentration of only one reactant. In other words, a first-order reaction is a chemical reaction in which the rate varies based on the changes in the concentration of only one of the reactants
Every mole of SO₂Cl₂ that dissociates results in a mole of SO₂ &Cl₂
[tex]\rm P_{total}= P_{Cl_{2}\\}+ P_{SO_{2}Cl_{2}}+ P_{SO_{2}}\\\\ P_{total} = P_{o}- \beta +\beta + \beta\\\\ P_{total} = P_{o}+\beta[/tex]
For first order plot of ln( [tex]P_{SO_{2}Cl_{2}}[/tex]) vs time will be a straight line.
t(hr) [tex]P_{SO_{2}Cl_{2}}[/tex] ln([tex]P_{SO_{2}Cl_{2}}[/tex] )
0 11.07 2.404
3 7.35 1.995
6 4.88 1.585
9 3.24 1.176
12 2.15 0.765
15 1.43 0.358
β = P(total) - P(initial)
[tex]\rm P_{SO_{2}Cl_{2}}[/tex] = P₀ - β
for t= 3
β =3.72
and
[tex]\rm P_{SO_{2}Cl_{2}}[/tex] = 7.35
For first order plot of ln( [tex]P_{SO_{2}Cl_{2}}[/tex]) vs time will be a straight line, which shows first order reaction.
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will favor dissolution and
will favor crystallization in a saturated solution of table sugar.
a. cooling, heating
b. heating, cooling
C. evaporation, heating
d. cooling, evaporation
Answer:
b) heating, cooling
Explanation:
Heating will favour dissolution (it helps dissolving faster).
Cooling helps in crystallization.
how many liters of water are needed to prepare 756 g of CaCO3 for a 3.50 M solution? MM=100.1 grams/mole
The volume of water needed to prepare the solution given the data is 2.16 L
What is molarity?This is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:
Molarity = mole / Volume
How to determine the mole of CaCO₃Mass of CaCO₃ = 756 g Molar mass of CaCO₃ = 100.1 g/mol Mole of CaCO₃ =?Mole = mass / molar mass
Mole of CaCO₃ = 756 / 100.1
Mole of CaCO₃ = 7.55 moles
How to determine the volume Mole of CaCO₃ = 7.55 molesMolarity = 3.5 MVolume = ?Volume = mole / molarity
Volume = 7.55 / 3.5
Volume = 2.16 L
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1. How many moles are in 78.9g of HCI?
a sample of sulfur dioxide occupies a volume of 652 mL at 40.0 C and 0.75 atm. What volume will the sulfur dioxide occupy at STP?
The volume that sulfur dioxide will occupy with a volume of 652 mL at 40.0°C and 0.75 atm is 0.019moles. Details about volume can be found below.
How to calculate volume?The volume of a gas can be calculated using the following formula:
PV = nRT
P = pressureV = volumen = number of molesR = gas law constantT = temperature0.75 × 0.652 = n × 0.0821 × 313
0.489 = 25.69n
n = 0.489/25.69
n = 0.019moles
Therefore, the volume that sulfur dioxide will occupy with a volume of 652 mL at 40.0°C and 0.75 atm is 0.019moles.
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Please help!!
Is this an:
Acid
Base
Neither
Answer:
it is a weak acid
acid
Explanation:
formaldehyde is a weak acid (pK greater than 13),
A waste treatment settling tank treats an industrial waste inflow (QIN) of 0.2 m3/s with a suspended particulate concentration (CIN) of 2000 mg/L. The settling reactor has a sludge flow (SS) to a centrifuge of 360 grams/s, and a flow (QS) of 0.050 m3/s. The centrifuge has a return flow (QR) to the settling tank of 0.048 m3/s and a concentration (CR) of 408 mg/L.
1. What is the effluent flow (QE, in m3/s), concentration (CE, in mg/L) and particulate mass flow (SE, in grams/s)
2. What is the concentration (CDW) and particulate mass flow rate (SDW) for the dewatered sludge?
The effluent flow in concentration and particulate mass flow will be 0.198m³/sec.
How to calculate the effluent flow?It should be noted that the total inflow will be equal to the total outflow. Therefore,
0.2 + 0.048 = 0.05 + We
Collect like terms
Qe = 0.2 + 0.048 - 0.05
Qe = 0.198m³/sec
The concentration will be:
= (360 × 1000)/0.05
= 7200mg/L.
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What is the molarity of .200 L of solution in which 2.0 moles of sodium bromide is dissolved?
Answer:
it’s 10ml
Explanation:
200/2 = 10
3. Determine the amount of energy required to heat 3.50 moles of water vapor from 107°C to 13
4. How much energy is needed to heat a 27.50 grams of H₂O (s) at -20°C to H₂O (l) at 0°C?
Answer: See attached image
Explanation:
calculate the mass of copper that could be made from 4.0g of copper oxide
The mass of copper that will be produced from copper oxide is determined as 3.19 g.
Mass of copper produced from copper oxide
The mass of copper that will be produced from copper oxide is calculated as follows;
2Cu + O₂ -----> 2CuO
2 1 2
2(63.5) ------------ 2(79.5)
x ---------------------- 4 g
x = (4 x 2 x 63.5)/(2 x 79.5)
x = 3.19 g
Thus, the mass of copper that will be produced from copper oxide is determined as 3.19 g.
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Which best describes a difference between laser light and regular light? Laser light is less concentrated. Laser light has a beam that spreads out. Laser light is made of one specific color. Laser light pumps out light particles one at a time.
Answer:
Laser light is made of one specific color
Explanation:
Regular light is a mixture of electromagnetic waves of different wavelengths
Laser light is monochrome (one colour).
common laser colors are
red , green and violet
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biglasers.com
Answer: C
Explanation: got it right on edge 2023
Use the equation to answer the following question.
2H₂ + O₂ → 2H₂O
How many grams of H₂O are produced from 64.0 g of O₂?
O A. 72.1 g
Answer:
rsghkm vumm
Explanation:
el correo de confirmación con la que se ha enviado desde correo ok recibido gracias saludos María del Ca
what is the effect of temperature and pressure on crystal structure ?
ty! :)
Answer:
Increase of pressure increases the coordination number during crystallization e.g. by applying pressure the NaCl type crystal structure having 6:6 coordination number changes to CsCl type crystal having coordination number 8:8.
welc!! you Σ=)
[Co(H2O)6]2+ what is the name
The same elements may combine in different ratios to form the same compound?
Answer:
law of multiple proportion
Explanation:
A system is a group of parts that can be considered one unit. Storm systems, ecosystems, and our bodies are natural systems. Cars and houses are human-made systems. Choose an example of a system, and analyze the energy flow through the system. Describe in detail how energy enters the system, how energy changes form while in the system, and how energy leaves the system.
An ecosystem is simply a collection of communities of plants, animals, and microbes interacting together and with their physical environments.
Energy flow in an ecosystemEnergy enters the ecosystem through a group of living organisms known as the producers. the producers are mainly the green plants that are capable of photosynthesizing.
Photosynthesis converts solar radiation from the sun to chemical energy in green plants. Another group of organisms in the ecosystem, the primary consumers, feed directly on the producers and as such, are able to gain some energy from them.
The secondary consumers obtain their own energy by feeding on primary consumers. Tertiary consumers feed on the secondary consumers for their own energy and the food chain goes on and on.
Only about 10% of the available energy in one trophic level goes to the next trophic level. The rest of the energy is lost as heat to the surroundings. Thus, the producers have the highest energy in the ecosystem while organisms at the top of the food chain have the lowest energy.
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MgCl2(aq) + NaOH(aq) →
Explanation:
MgCl2(aq) + NaOH(aq) = Mg(OH)2(s) + NaCl. Both magnesium nitrate and sodium hydroxide solutions are colourless solutions. When they react with each other, a white precipitate (Mg(OH)2) and a colourless solution is given. Sodium chloride exists in the colourless aqueous solution.
The density of methane at 0 degree Celsius and 1 atm pressure is 0.668g/L. If 1 lb is equal to 454 grams, 1 L is equal to 1000cm3 and 1 inch is equal to 2.54 cm, what is the density in pounds per cubic inch
The value of density in the required units is [tex]\rm \rho = 2.4\times 10^{-5} lb/in^{3}[/tex]
What is Density ?Density, mass of a unit volume of a material substance. The formula for density is
d = M/V
where d is density, M is mass, and V is volume.
Density is commonly expressed in units of grams per cubic centimetre.
In the given question
Density given is 0.668 g/L
1 lb = 454grams.
1L = 1000 cm³
1 inch = 2.54 cm
Density in pounds per cubic inch =
[tex]\rm \rho = 0.668 \times \dfrac{(1 \;lb)(1 grams)}{454\; grams}\times \dfrac{(1 L)(2.54)^{3}(1 cm^{3})}{1000cm^{3}(1\;L)(1 in^{3})}[/tex]
[tex]\rm \rho = 2.4\times 10^{-5} lb/in^{3}[/tex]
Therefore the value of density in the required units is [tex]\rm \rho = 2.4\times 10^{-5} lb/in^{3}[/tex].
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Students conducting a lab investigation are given two unknown tubes of colorless aqueous solutions. The students are told that one tube is a salt solution and the other is a sucrose solution. How can the students determine which of the solutions contains salt?
The students can determine which of the solutions contains salt through the conductive tester.
What is an ionic solution?It is a solution containing ions are atoms that have gained or lost electrons to acquire a positive (lost electron) or negative (gained electron) charge.
An ionic solution would be able to conduct electricity whereas the covalent would not so if you have a conductivity tester which is available in most labs.
The students can distinguish between the 2 solutions through the conductive tester.
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7. How many molecules are in 4.80 moles of NaCL?
Answer:
280gr of salt
Explanation:
4.80 x ( 22.99 + 35.45) = 280gr
Simple as that