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Q.

The mass of $6.023 \times 10^{23}$ molecules of CO is

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a

7.0 g

b

14 g

c

56 g

d

28 g

answer is A.

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Detailed Solution

1 mole of a substance is equal to its molecular mass expressed in terms of grams.

Gram molecular mass of CO = 12 + 16

= 12 + 16

= 28g

Mass of 1 mole (6.023 X 10₂₃ molecules) of CO is about 28g.

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The mass of 6.023×1023 molecules of CO is