A 6.7 L sample of a gas has a mass of 7.9 g at Standard temperature and pressure. What is the molar mass of the gas?
Round your answer to 2 decimal spaces.

You don't even have to tell me the answer just like an equation or an EXPLANATION!!!!

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nikitarahangdaleVT nikitarahangdaleVT · Answer 1 · 2022-05-05T11:05:11+02:00

The molar mass of gas sample whose mass is 7.9g at Standard temperature and pressure is 26.4 g/mol.

Molar mass of any substance will be calculated by using the below equation:

M = W/n, where

M = molar mass

W = given mass

n = moles

First we calculate the moles of gas by using the ideal gas equation:

PV = nRT, where

P = standard pressure = 1 atm

V = volume = 6.7 L

n = moles of gas?

R = universal gas constant = 0.082 L.atm/K.mol

T = absolute temperature = 273K

On putting values, we get

n = (1)(6.7) / (0.082)(273)

n = 0.299 moles

Now we get the molar mass of gas by putting values on the first equation, we get

M = 7.9g / 0.299mol = 26.4 g/mol

Hence molar mass of given gas is 26.4 g/mol.

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