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Q.

The mass of 1.5 × 10²⁶ molecules of a substance is 16kg. The molecular mass of the substance is

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a

64g

b

64 a.m.u

c

16 a.m.u

d

32 a.m.u

answer is B.

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Detailed Solution

1.5 × 10²⁶ →16 × 10³ gm
6 × 10²³ → 64 gm = molar mass
$\Rightarrow$ molecular mass = 64 amu

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The mass of 1.5 × 1026 molecules of a substance is 16kg. The molecular mass of the substance is