Question

Calculate the number of moles contained in 85g of ammonia

Answer 1

Explanation:

Ammonia ( Molar mass ) = NH3

= N x 1 + H x 3

= 14 + 3

= 17g

No. of moles = Given mass / Molar mass

= 85 / 17

= 5 moles

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Answer 2

Answer:

The number of moles of NH₃ present in 85grams mass of ammonia will be equal to five moles.

Explanation:

We have given, the mass of ammonia (NH₃) $= 85g$

Let's calculate the molecular mass of one molecule of ammonia,

Molecular mass of NH₃ $= 14+3(1)=17gmol^{-1}$

To find the number of moles for a given mass of compound, we divide the given mass of the compound with molecular mass of that compound.

Number of moles $=\frac{Given \; mass}{Molecular\; mass}$

Number of moles of ammonia present in 85g of its mass will be:

Number of moles of NH₃ $=\frac{85}{17}=5moles$

Therefore, five moles of ammonia will be present in  85 grams of mass of ammonia.