Question

Mass of 112 ml of a certain gas is 0.22 g at STP. How many molecules are there i leaf gas What is the molar mass of the gas​

Answer 1

Answer:

Given,

mass of the given gas, m = 0.22 g

volume of the given gas, V = 112 ml or 0.112 L

To Find,

• number of molecules of the given gas present
• molar mass of the gas

Solution:

We know,

On substituting the values, we get

1 mol = 6.022 × 10²⁴ atoms / molecules

0.005 mol = 6.022 × 0.005 × 10²⁴

➜ 6.022 × 5 × 10²¹

➜ 30.11 × 10²¹ molecules

Also,

No. of moles = Mass given / Molar mass

0.005 = 0.22 / molar mass

molar mass = 0.22 / 0.005

molar mass = 44 g