Question

A sample of ammonia weighs 3.00 g. What mass of sulphur trioxide contain the same number of molecules as are 3.00 gram ammonia

Answer 1

Given,

A sample of ammonia weight is 3.00 g

To find,

Mass of sulphur trioxide contain the same number of molecules as are 3.00 g of ammonia

Solution,

The molar mass of ammonia is 17 g/mole.

So the number of molar mass will be calculated by dividing 3 g by 17/mole

The number of the molar mass of ammonia= 3 g/17g per mole

The number of the molar mass of ammonia = 0.1764mol

The molecular mass of sulphur trioxide = 1× 32u + 3×16u

The molecular mass of sulphur trioxide = 80u

Now,

Weigh of 1 mole of sulphur trioxide is 80g

Weigh of 0.1764mole of sulphur trioxide = 80g × 0.1764g

Weigh of 0.1764mole of sulphur trioxide = 14.11 g

Hence, the mass of sulphur trioxide contain the same number of molecules as are 3.00g of ammonia is 14.11g