Question

how many Grams of NH3 is there in 800 cm3 at STP of NH3 gas?

Answer 1

Given:

Volume of NH3 at STP = 800 cm³ = 0.8 Litre

To Find:

Mass of NH3

Calculation:

At STP, 22.4 litre (1 mole) of NH3 has mass = 17 gram

⇒ 1 litre of NH3 has mass = 17/22.4 = 0.759 g

⇒ 0.8 litre of NH3 has mass = 0.759 × 0.8

⇒ 0.8 litre of NH3 has mass = 0.607 gram

- So the mass of 800 cm³ NH3 gas at STP is 0.607 gram.