Question

Do
water and heavy water obey law of multiple proportions?can anyone tell y the ans is no

Answer 1

.........................................HEY BUDDY................................................................. ..................HERE IS THE ANSWER TO YOUR QUESTION............................

Answer:

NO

Explanation:

The law of multiple proportions (or Dalton's Law) states that;

"If two elements form more than one compound between them, then the ratios of the masses of the second element which combine with a fixed mass of the first element will be ratios of small whole numbers."

Hydrogen and oxygen can combine to form two compounds, H2O and H2O2 which combine according to the fallowing reactions;

2 H2 + O2 ----> 2 H2O

  H2 + O2 ----> H2O2

So, if we have a fixed mass of H2 of say 50g then the mass of oxygen which will react with this to form water is;-

50 /(2*2.016) * 31.999 = 396.813g O2

... and for the formation of hydrogen peroxide the same calculation is;-

50 /2.016 * 31.999 = 793.626g O2

The ratio of these to two masses of O2 is;-

(396.813 / 793.626 ) = 0.5

0.5 can be expressed as the ratio of 1:2 (a ratio of two small whole numbers)

That's the long method, but a simpler method would be to realise that the equations forming water and hydrogen peroxide can be written with respect to a constant mass of hydrogen i.e.;-

  H2 + O  ---->  H2O

  H2 + O2 ----> H2O2

From these equations it is clear that the ratio of the molar masses of oxygen in these two cases is indeed 1:2.

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