Question

If 300ml of a gas weighs 0.368gram at STP what is it's molecular mass

Answer 1

$\huge\green{As-Salamu-Alykum }$

_______________

$\huge\blue{Given:-}$

Mass of gas = 0.368g

Volume of gas = 300ml

Volume of gas = 300/1000=0.3litre

$\huge\purple{Required:-}$

Molar mass if gas =?

$\huge\blue{Solution:-}$

Moles of gas = Volume in litre/volume at STP

Moles =0.3/22.4

Moles of gas= 0.013mol

Moles of gas=mass/molar mass

Molar mass of gas =moles × moles

Molar mass of gas = 0.013 × 0.013

Molar mass of gas =0.00169 g/mol

______________

$\huge\red{INSHALLAH it will help U}$