1.

A gas cylinder can hold 1 kg of hydrogen at room temperature and pressure:(i) Find the number of moles of hydrogen present.(ii) What weight of CO2 can the cylinder hold under similar conditions of temperature and pressure? (H= 1, C = 12,O -16)

Answer»

(i) Weight of hydrogen = 2 × 1 g = 2 g

2 g of hydrogen corresponds to 1 mole of hydrogen

1 g of hydrogen corresponds to mole of hydrogen

1000 g of hydrogen corresponds to × 1000 g mole of H2 = 500 moles 

(ii) 1 mole of H2 occupy 22.4 L 500 mole of H2 occupy = 22.4 x 500

By Avogadro’s law the volume occupied by CO2 will be same Weight of CO2 = 12 + 2 x 16 = 44 g

22.4 L will weigh 44 

1L will weigh \(\frac{44}{22.4}\)

22.4 x 500L will weigh \(\frac{44}{22.4}\times500\) = 22000g = 22kg



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