Question

2.
Mass of 112 mL of a certain gas is 0.22 g at STP. How many molecules are there in the
sample of gas ? What is the molar mass of the gas ?

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Answer 1

Answer:

At stp,

the molar volume of any gas is 22.4 litre .means 22.4 litre of a gas contains 6.022×10^23 molecules

So, number of molecules in sample of gas is

112ml÷22400ml

After it divide 6.022×10^23 by the number of molecules and multiply by the given weight

you will get the molar mass of the gas.