Question

At standard conditions 3.56L of a gas weighed 11.3 g. Its molar mass isGroup of answer choices3.17 g/mole11.3 g/mole40.2 g/mole71.1 g/mole79.7 g/mole

Answer 1

Explanation:

The molar volume corresponds to the volume occupied by any gas at STP, which is equal to 22.4 L.

So:

22.4 L ---- 1 mol

3.56 L ---- x mol

x = 0.159 moles

To find the molar mass we use the following formula:

molar mass = mass/moles

molar mass = 11.3/0.159

molar mass = 71.1

Answer: 71.1 g/mole