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Which has more molecules: 3 g of hydrogen, H₂, or 64 g of oxygen, O₂?

Try it on paper first. A hint, the key idea and the worked solution are here when you need them.

Which has more molecules: $3\ \text{g}$ of hydrogen, $\text{H}_2$ , or $64\ \text{g}$ of oxygen, $\text{O}_2$ ? How many times as many? Use $\text{H} = 1$ and $\text{O} = 16$ .

Need a reminder? The key ideaShow

One mole holds $N_A = 6.022 \times 10^{23}$ particles. $n = \dfrac{m}{M}$ and $N = n \times N_A$ . To count atoms, multiply the molecules by the atoms in one molecule. The mass of one particle is $\dfrac{M}{N_A}$ .

The worked solution

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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.

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Which has more molecules: 3 g of hydrogen, H₂, or 64 g of oxygen, O₂?

The worked solution

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