Question

1. What is the ratio between masses of (a) hydrogen and oxygen in H2O (b) nitrogen and hydrogen

in NH3? [Atomic mass of H = 1 u, O = 16 u, N = 14 u]

2. What is the ratio between masses of carbon and oxygen in CO2?

[Atomic mass of C = 12 u, O = 16 u]

3. As per the law of definite proportions carbon and oxygen combine in a ratio of 3 : 8. Compute the

mass of oxygen gas that would be required to react completely with 6 g carbon​

Answer 1

Answer:1.a. the mass of oxygen is 16u and that of hydrogen is 1u. The no. Of molecule of hydrogen to that oxygen is 2:1 so their mass ratio is 2:16 which is 1:8.

B. Similarly the ratio of molecule of nitrogen to that of hydrogen is 1:3 so their mass ratio is 14:3.

2.the ratio here is 12:32 that is 3:8. It is because that the ratio of molecules is 1:2.

3. The ratio was 3:8.

Let us assume that the nos. Be 3x and 8x

=>3x=6

=>x=2

So the mass of oxygen is 16.

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Answer 2

Answer

ans1- (i) H2O

H=1X2=2

O=16

:. mass ratio= 2/16=1/8=1:8

(ii) NH3

N=14

H=1x3=3

:. mass ratio!= 14/3=14:3.

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