GED Science - Moles | Practice Hub

Atomic mass values:

$H\rightarrow 1.0\frac{g}{mol}$

$S\rightarrow 32.1\frac{g}{mol}$

$O\rightarrow 16.0\frac{g}{mol}$

Convert the following mass to moles:

$12.05g\ H_2SO_4$

$0.12\ \text{moles}$

$1181.80\ \text{moles}$

$7.40\times 10^{24}\ \text{moles}$

$7.12\times 10^{26}\ \text{moles}$

To convert grams to moles, use the molecular weight of the molecule. This is found by adding the mass of each atom.

$H_2SO_4\rightarrow 2(H)+1(S)+4(O)$

$2(1.0\frac{g}{mol})+(32.1\frac{g}{mol})+4(16.0\frac{g}{mol})=98.1\frac{g}{mol}$

$\frac{98.1g\ H_2SO_4}{1mol\ H_2SO_4}$

Now we can use the molecular mass to convert the given mass in the question to moles. Make sure to align the values so that the units cancel out.

$12.05g\ H_2SO_4\times \frac{1mol\ H_2SO_4}{98.1g\ H_2SO_4}=0.12mol\ H_2SO_4$

Moles