# How do you work out the percentage of each element in sodium hydrogen sulfate ?

Feb 16, 2015

Work out the ${M}_{r}$ by adding up the ${A}_{r}$ values as they occur in the formula, then work out the % contribution each element makes.

#### Explanation:

Work out the ${M}_{r}$ by adding up the ${A}_{r}$ values as they occur in the formula.

I'll use approximate values:

${A}_{r} N a = 23$

${A}_{r} H = 1$

${A}_{r} S = 32$

${A}_{r} O = 16$

${M}_{r}$ of $N a H S {O}_{4}$:

$= 23 + 1 + 32 + \left(4 \times 16\right) = 120$

Then work out the % contribution each element makes:

%$N a = \frac{23}{120} \times 100 = 19.16$

%$H = \frac{1}{120} \times 100 = 0.833$

%$S = \frac{32}{120} \times 100 = 26.66$

%$O = \frac{64}{120} \times 100 = 53.33$