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Molecular Mass

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Question

Calculate the formula unit mass (u) of ${N a}_{2} O$ .
$A t o m i c m a s s o f N a = 23 u, O = 16 u$

A

60

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B

62

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C

61

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D

59

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Solution

The correct option is D $62$
Formula unit mass (u) of ${N a}_{2} O$ = 2 x atomic mass of sodium + atomic mass of oxygen
$= 2 \times 23 + 16 = 62 u$

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