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Atomic Number and Mass Number

Relative mole...

Question

Relative molecular mass of water is __________.

A

18

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B

16

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C

12

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D

14

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Solution

The correct option is C 18
Relative molecular mass for water $(H_{2} O)$
$= 2 \times$ relative atomic number for hydrogen $+ 1 \times$ relative atomic number for oxygen
$= 2 \times 1 + 1 \times 16$
$= 18$
So, relative molecular mass for water is 18.

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