# What is the percent by weight of sodium in sodium sulfate?

$\text{Percentage sodium}$ $=$ $\text{Mass of sodium"/"Mass of sodium sulfate}$ $=$ ??%
$\text{Mass of sodium"/"Mass of sodium sulfate}$ $=$ (2xx22.99*g*mol^-1)/(142.04*g*mol^-1)xx100% $\cong$ 30%