what is the percent by mass of sodium in $na_2so_4$? use %element = $\frac{total mass of element in…

what is the percent by mass of sodium in $na_2so_4$? use %element = $\frac{total mass of element in compound}{molar mass of compound}\times100$ 16.18% 22.58% 32.37% 45.98%

what is the percent by mass of sodium in $na_2so_4$? use %element = $\frac{total mass of element in compound}{molar mass of compound}\times100$ 16.18% 22.58% 32.37% 45.98%

Answer

Answer:

C. 32.37%

Explanation:

Step1: Calculate molar mass of Na₂SO₄

The molar mass of Na is 22.99 g/mol, S is 32.07 g/mol, and O is 16.00 g/mol. $M_{Na_2SO_4}=2\times22.99 + 32.07+4\times16.00=142.05$ g/mol

Step2: Calculate total mass of sodium in Na₂SO₄

There are 2 Na atoms. So total mass of Na is $2\times22.99 = 45.98$ g/mol

Step3: Calculate percent by mass of sodium

$%Na=\frac{45.98}{142.05}\times 100\approx32.37%$