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Question 2

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

Given,

Ratio of hydrogen and oxygen by mass = 1:8 

Mass of oxygen gas that completely reacts with 1g of hydrogen gas is equal to 8 g i.e Mass of oxygen gas that completely reacts with 3 g of hydrogen gas

= 8 x 3 = 24g. 

Hence, 24 g mass of oxygen gas is required to react completely with 3 g of hydrogen gas.

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