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Atomic Number and Mass Number

12 g of a tri...

Question

$12 g$ of a trivalent element combines with $4 g$ of oxygen. Its atomic mass is:

48

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72

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3

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36

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Solution

The correct option is C $36$
Equivalent mass of metal $= \frac{Weight of metal}{Weight of oxygen} \times 8$

$= \frac{12}{8} \times 8$

$= 12$

Therefore, atomic mass = Equivalent weight $\times$ valency

$= 12 \times 3$

$= 36 g m$

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