Question

How many grams of Pb are there in a sample of Pb that contains 1.15×1024 atoms? grams

Answer 1

Solution:

$\text{mass of Pb = 1.15 × 10²⁴ Pb atoms} × \frac{\text{1 mol Pb}}{\text{6.022 × 10²³ Pb atoms}} × \frac{\text{207.2 g Pb}}{\text{1 mol Pb}}$

$\boxed{\text{mass of Pb = 396 g}}$