Question

how many h atoms are in one formula unit of (nh₄)₂so₄?

Explanation:

Step1: Analyze ammonium part

In $(NH_4)_2SO_4$, the ammonium ion is $NH_4$. Each $NH_4$ has 4 H - atoms.

Step2: Consider the coefficient

There are 2 ammonium ions ($(NH_4)_2$) in the formula unit. So the total number of H - atoms is $4\times2$.
$4\times2 = 8$

Answer:

8