Question

The average mass of an atom of the uranium is 3.9 * 10^-25 kg. Find the number of atoms in 1 g of uranium.

Answer 1

Hey there!

Given,

Mass of one atom of uranium = 3.9 * 10^-25 kg = 3.9 * 10^-22 g

[ 1 kg = 1000 g]

Number of atoms in 1  g of uranium = 1 / 3.9*10^-22 = 2.56 * 10^21

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Answer 2

Mass, $2.56\times 10^{21}$

Explanation:

It is given that,

The average mass of an atom of the uranium is $3.9\times 10^{-25}\ kg$.

We need to find the number of atoms in 1 gram of uranium. We know that, 1 kg = 1000 g

Mass of an atom of uranium is, $3.9\times 10^{-22}\ g$.

Now using unitary method to find number of atoms in 1 gram of uranium.

Number of atoms in 1  g of uranium, $m=\dfrac{1}{3.9\times 10^{-22}}=2.56\times 10^{21}$

Hence, this is the required solution.

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