# 0.465 g sample of an unknown compound occupies 245 mL at 298K and 1.22 atm. What is the molar mass of the unknown compound?

##### 2 Answers

Mar 20, 2015

The molar mass of the gas is 38.0 g/mol.

One way to solve this problem is to use the Ideal Gas Law.

The relative molar mass is 38.0 g/mol.

#### Answer:

38.4g

#### Explanation:

So 0.0121 moles weigh 0.465g

So 1 mole weighs

nb I converted to Pa and used 8.31 for R. It depends which R value you are given.