Question

When 6 grams of hydrogen gas was burnt with 48 grams of oxygen, 54 grams of water was
produced. In other experiment when electric current was passed through 36 grams of water
then 4 grams of hydrogen and 32 grams of oxygen were formed.
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(i) Calculate the mass ratio of hydrogen and oxygen which combine to form water.
(ii) Calculate the mass ratio of hydrogen and oxygen formed when electric current was
passed through water.
(iii) Write the name of the law of chemical combination which is verified by these
experiments.
​

Answer 1

Answer:

The molecular masses of hydrogen, oxygen and water are 2 g/mole, 32 g/mole and 18 g/mole respectively.

2H2+O2→2H2O

 2×2=4 g of hydrogen reacts with  1×32=32 g of oxygen to form  2×18=36 g of water.

Hence, 44=1 g of hydrogen reacts with  432=8 g of oxygen to form  436=9 g of water.

9 grams of water can be produced when 8 g of hydrogen reacts with 8 g oxygen.