1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Marysya12 [62]
3 years ago
11

A 0.465 g sample of an unknown compound occupies 245 ml at 298 k and 1.22 atm. what is the molar mass of the unknown compound?

Chemistry
2 answers:
nekit [7.7K]3 years ago
6 0
<span>we can find the number of moles of gas using the ideal gas law equation
                                                                                                 
PV = nRT
                                                                                                 
where P - pressure - 1.22 atm
                                               
V - volume - 0.245 L
                                                                                               
n - number of moles
                                                                                               
R - gas constant - 0.08206 L.atm/mol.K
                                               
T - temperature - 298 K
                                                                                               
substituting the values in the equation
                                                   
1.22 atm x 0.245 L = n x 0.08206 L.atm/mol.K x 298 K
                                               
n = 0.0122 mol
                                                                                               
molar mass of compound = mass present / number of moles therefore molar mass = 0.465 g / 0.0122 mol = 38.1 g/mol
the answer is d) 38.0 g/mol </span>
wel3 years ago
3 0

Answer: Option (d) is the correct answer.

Explanation:

It is know that for an ideal gas PV = nRT

where     P = pressure

               V = volume

               n = number of moles = \frac{mass}{molar mass}

                R = gas constant = 0.082 L atm K^{-1} mol^{-1}

                T = temperature

Therefore, put the given values in the formula above as follows.

                   PV = nRT

or,               PV = \frac{mass}{molar mass}RT

               1.22 atm \times 0.245 L = \frac{0.465 g}{molar mass} \times 0.082 L atm K^{-1} mol^{-1} \times 298 K

                molar mass = 38.12 g/mol

                                    = 38.0 g/mol (approx)

Therefore, we can conclude that the molar mass of the unknown compound is 38.0 g/mol.

You might be interested in
The picture below is a great example of __________ biodiversity.
ss7ja [257]
Low because it is not diverse. It is just seed corn.
6 0
3 years ago
A 100.0 lb skier moves at 40.00miles/hour. Calc her kinetic energy.
Pepsi [2]

answer: its 7290 joules.

explanations: the first procedure is to convert 1 pound to kilogram. 1 kg = 2.205 hence given 100 lb so we cross multiply. 1 kg * 100 = 2.205 * x

hence x= 45 kg. let's convert 1 mile per hour = 0.45 metre per second we cross multiply by 40 mile per hour. x= 40 * 0.45= 18 m/s.

KE= 1/2 * 45 * (18)^2

= 1/2 * 45 * 14580

= 7290joules

5 0
3 years ago
What are 4 other gases in the atmosphere besides oxegen and nitergin?
Levart [38]
Helium, neon,nitrogen and argon
5 0
3 years ago
What are the answers for this question<br> Don't just answer for points
Kisachek [45]

Answer:

i cant see it very much i dont think no one can

Explanation:

5 0
3 years ago
Read 2 more answers
The combustion reaction of magnesium results in what compound?
Tasya [4]
C. MgO because mg+o= MgO
7 0
3 years ago
Read 2 more answers
Other questions:
  • A sample of well water is tested and found to have 1350 ppm Iron. If a 1000g sample was tested, how many grams of iron were in i
    5·1 answer
  • For this discussion, respond to the following... An electron falls through a distance d in a uniform electric field of magnitude
    5·1 answer
  • Which of the following regions of the periodic table tends to prefer a –1 charge and occupies Group 17?
    8·1 answer
  • which of the following properties of water is due primarily to the uneven distribution of charge between the hydrogen and oxygen
    10·1 answer
  • Select the correct location on the image
    10·2 answers
  • 2. For the following reaction, calculate how many moles of each product are formed when 0.356
    7·1 answer
  • What is the name for CH3-CH2-CH2-O-CH2-CH3?
    15·1 answer
  • The plant on the left is growing more because it has been receiving more water
    5·1 answer
  • The mixture of carbon dioxide and water tastes salt why​
    5·1 answer
  • It takes 50.0 J to raise the temperature of an 10.6 g piece of unknown metal from 13.0°C to 24.9 °C.
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!