Q.

The mass of a molecule of water is

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a

3 ×  10−26  kg

b

3 ×  10−25  kg

c

1.5 ×  10−26  kg

d

2.5 ×  10−26  kg

answer is A.

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Detailed Solution

6 ×  1023  molecules has  mass=18 g1  molecules has  mass=186 ×  1023                              =3  ×  10−23  g                               =3  ×  10−26  kg
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