Question

calculate the formula unit mass of Na2SO4(atomic mass:Na-23u, S=32u, O=16u, H=1u)​

Answer 1

Given: The given compound is $Na_2SO_4$.

To find: We have to find the formula unit mass.

Solution:

The given compound is $Na_2SO_4$.

The atomic mass of the Na atom is 23u.

The atomic mass of Sulfur is 32 and oxygen is 16.

This compound has two Na, one sulfur and four oxygen atoms.

So, the formula unit mass of $Na_2SO_4$ will be-

$23 \times 2 + 32 + 16 \times 4 \\ = 46 + 32 + 64 \\ = 142$

The formula unit mass of $Na_2SO_4$ is 142 units.