Question

Evaluate Yourself
3a) Calculate the number of moles
present in 9 g of ethane.
3b) Calculate the number of molecules
of oxygen gas that occupies a volume
of 224 ml at 273 K and 3 atm pressure.​

Answer 1

3a) Atomic mass of ammonia=30.07u

Molar mass of ammonia=30.07g

Thus,the number of mole=

Given mass/Molar mass

9/30.07=0.29930163

3b)