Question

Mass of 112 mL of a certain gas is 0.22g at STP . how many molecules are there in the sample of gas? what is the molar mass of the glass?​

Answer 1

Answer:

➜ number of molecules = 30.11 × 10²¹ molecules

➜ molar mass of the gas = 44 g

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

Now,

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