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

Answer:

1 g of hydrogen reacts with = 8 g of oxygen

∴ 3 g of hydrogen reacts with = 8 × 3 = 24 g of oxygen.

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

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Answer 2

EXPLANATION

2H

2

+O

2

→2H

2

O

4g 32g 3

6g

Since, 32 g of oxygen reacts with 4g of H

2

.

So, 3g of H

2

will require =

4

3×32

=24 grams of O

2