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8.50g of CuO when heated in a current of dry hydrogen gas gave 6.58g of copper and 2.16g of wate Calculate the proportion of oxygen to hydrogen by mass in water.

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Eduard22sly

The proportion of oxygen to hydrogen by mass in the water is 8 : 1

Data obtained from the question

  • Mass of CuO = 8.50 g
  • Mass of Cu = 6.58 g
  • Mass of water = 2.16g
  • Proportion =?

How to determine the mass of O in water

  • 1 mole of water (H₂O) = (2×1) + 16 = 18 g
  • Mass of O in water = 16 g

18 g of water contains 16 g of O.

Therefore,

2.16 g of water will contain = (2.16 × 16) / 18 = 1.92 g of O

How to determine the mass of H in water

  • Mass of water = 2.16 g
  • Mass of O in water = 1.92 g
  • Mass of H =?

Mass of H = mass of water – mass of O

Mass of H = 2.16 – 1.92

Mass of H = 0.24 g

How to determine the proportion of oxygen to hydrogen

  • Mass of O  = 1.92 g
  • Mass of H = 0.24 g
  • Proportion =?

Proportion = oxygen / hydrogen

Proportion = 1.92 / 0.24

Proportion = 8 : 1

Learn more about mass composition:

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