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JAMB Chemistry 2018 Paper

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Question : 27

Total: 87

What volume of oxygen will remain after reacting 8cm

^3

of hydrogen gas with 20cm

^3

of oxygen gas

10cm $^3$
12cm $^3$
14cm $^3$
16cm $^3$

Solution:

Concept:

Use the volume ratio from the balanced equation:

2\mathrm{H}_2 + \mathrm{O}_2 \to 2\mathrm{H}_2\mathrm{O}

.

Explanation:

From the equation,

2

volumes of hydrogen react with

1

volume of oxygen.

So

8\,\mathrm{cm}^3

of hydrogen reacts with

\frac{8}{2} = 4\,\mathrm{cm}^3

of oxygen.

Initial oxygen volume is

20\,\mathrm{cm}^3

.

Remaining oxygen volume

= 20 - 4 = 16\,\mathrm{cm}^3

.

Answer:

16\,\mathrm{cm}^3

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