Question

Hydrogen and oxygen combine in the ratio of 1 : 8 by mass to form water. What mass of oxygen gas would be required to react completely with 3 g of hydrogen gas?​

Answer 1

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Ratio of H : O by mass in water is:

Hydrogen : Oxygen —> H2O

∴ 1 : 8 = 3 : x

x = 8 x 3

x = 24 g

∴ 24 g of oxygen gas would be required to react completely with 3 g of hydrogen gas.

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Answer 2

Ratio of H : O by mass in water is:

Hydrogen : Oxygen —> H2O

∴ 1 : 8 = 3 : x

x = 8 x 3

x = 24 g

∴ 24 g of oxygen gas would be required to react completely with 3 g of hydrogen gas.