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3.40 g of ammonia at STP occupies volume of 4.48 dm3. Calculate molar mass of ammonia.

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1 Answers

Given : 

Mass of ammonia = 3.40 g

Volume at STP = 4.48 dm3

To Find : 

Molar mass of ammonia

Calculation : 

Let ‘x’ grams be the molar mass of NH3.

Molar volume of a gas = 22.4 dm3 mol at STP.

Volume occupied by 3.40 g of NH3 at S.T.P = 4.48 dm3

Volume occupied by ‘x’ g of NH3 at S.T.P = 22.4 dm3

∴ x = \(\frac{22.4\times 3.40}{4.48}\) 

= 17.0 g mol-1

∴ Molar mass of ammonia is 17.0 g mol-1

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