# What is the name for (NH_4)_2SO_4?

${\left(N {H}_{4}\right)}_{2} S {O}_{4}$ is an ionic compound.
$N {H}_{4}^{+}$ is the ammonium ion and $S {O}_{4}^{2 -}$ is the sulfate ion. For every sulfate ion, there must be two ammonium ions as to reach a neutral charge, thus the compound formula is ${\left(N {H}_{4}\right)}_{2} S {O}_{4}$.