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)

Given: Volume of CO₂ gas at STP = 112L

Gram molecular mass of CO₂ = 44g

First, we will calculate the number of moles so that we can find the mass of CO₂ gas

As we know 1 mole of any gas occupies 22.4 litres of volume.

∴ 1 mole of NH₃ = 22.4 litre

22.4 × Number of moles = 112 litres

Number of moles = 5

Now, we can calculate the mass of CO₂ gas by applying the formula given:

We can write,

Mass of CO₂ gas = Number of moles × GMM of CO₂

Mass of CO₂ gas = 5 × 44g

Mass of CO₂ gas = 220g

Thus, mass of 112 L CO₂ gas at STP is 220g

Now, number of molecules = Number of moles × 6.022 × 10²³

= 5 × 6.022 × 10²³

= 3.011 × 10²⁴

Thus, number of molecules of CO₂ is 3.011 × 10²⁴