Question

How many 204Pb atoms are there in an 857 mg lead sample?

Answer 1

Question #47592, Chemistry, Inorganic Chemistry

Mass fraction of $^{204}\mathrm{Pb}$ is 1.4%. So, mass of $^{204}\mathrm{Pb}$ is the sample is:

$$m_{204Pb} = \frac{1.4 * 857}{100} = 11.998\,g$$ $$\nu_{204Pb} = \frac{11.998}{204} = 0.059\,mol$$ $$N_{204Pb} = 0.059 * 6.02 * 10^{23} = 3.55 * 10^{22}$$

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