Formula mass unit of $N a_{2} C O_{3} .10 H_{2} O$ is :

290

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286

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180.02

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105.97

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Solution

The correct option is B 286
Formula unit mass of $N a_{2} C O_{3}$
= $2 \times a t o m i c m a s s o f N a + 1 \times a t o m i c m a s s o f C + 3 \times a t o m i c m a s s o f O$
$= 2 \times 22.98 + 1 \times 12.01 + 3 \times 16$
$= 105.97 u$
Formula unit mass of $10 H_{2} O = 10 \times a t o m i c m a s s o f H_{2} O$
$= 10 \times 18.02$
$= 180.02 u$
Formula unit mass of $N a_{2} C O_{3} .10 H_{2} O = 105.97 + 180.02$
$= 285.99 u$

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