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Q.

The mass of 20 1.5x10²⁰ atoms of an element is 15mg. The atomic mass of the element is

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a

60g

b

60mg

c

60

d

60amu

answer is C.

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Detailed Solution

$\begin{array}{l} 6 \times 10^{23} \to ? \\ = \frac{6 \times 10^{23} \times 15 \times 10^{- 3}}{1 .5 \times 10^{20}} = 60 \end{array}$

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The mass of 20 1.5x1020 atoms of an element is 15mg. The atomic mass of the element is