Q7 of 27 Page 46

Calculate the following.

Volume of 170 g ammonia at STP.


(GMM/GFM: H2O - 18 g, CaCO3 - 100 g, CO2 - 44 g, NH3 - 17 g)

Given: Mass of ammonia at STP = 170g

Molecular mass of NH3 = 17g


First, we will calculate the number of moles by applying the formula given:




Number of moles = 10


Thus, number of moles of CaCO3 is 10


Now 1 mole of any gas occupies 22.4 litres of volume.


∴ 1 mole of NH3 = 22.4 litre


10 moles of NH3 = 22.4 × 10 = 224 litres


Thus, the volume occupied by 170g of NH3 is 224 litres.


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Calculate the following.

Number of moles in 500 g of CaCO3.


(GMM/GFM: H2O - 18 g, CaCO3 - 100 g, CO2 - 44 g, NH3 - 17 g)

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Calculate the following.

Number of molecules and total number of atoms in 88 g of CO2.


(GMM/GFM: H2O - 18 g, CaCO3 - 100 g, CO2 - 44 g, NH3 - 17 g)

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Calculate the following.

The mass of 112 L CO2 gas at STP and the number of molecules.


(GMM/GFM: H2O - 18 g, CaCO3 - 100 g, CO2 - 44 g, NH3 - 17 g)

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