Question

What is the total number of atoms in 4 g of hydrogen?

Answer 1

To calculate the total number of atoms in a given amount of a substance, we need to use Avogadro's number, which represents the number of atoms or molecules in one mole of a substance.

Avogadro's number is approximately $6.022\times 10^{23}$ particles per mole.

First, we need to determine the number of moles of hydrogen in 4 grams of hydrogen. The molar mass of hydrogen is approximately 1 gram per mole. Therefore, the number of moles can be calculated as follows:

$$\text{moles of hydrogen}=\frac{\text{mass}}{\text{molar mass}}=\frac{4\text{g}}{1\text{g/mol}}=4\text{mol}$$