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Molecular Mass

Molar mass of...

Question

Molar mass of ethanol $(C_{2} H_{5} O H)$ is:
(Atomic masses: C = 12 u, H = 1 u, O = 16 u)

A

34

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B

38.9

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C

46

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D

45.1

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E

62.1

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Solution

The correct option is A $46$
Molar mass of ethanol ( $C_{2} H_{5} O H$ ) $= (2 \times a t o m i c m a s s o f c a r b o n) + (6 \times a t o m i c m a s s o f h y d r o g e n) + (1 \times a t o m i c m a s s o x y g e n)$

$= 2 (12) + 6 (1) + 1 (16) = 46 g / m o l$

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