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QUESTION
What is the mass of hydrogen in 49.2 g ammonium hydrogen phosphite?
If you mean ammonium hydrogen phosphate, ##(NH_4)_2HPO_4" (ammonium biphosphate)"##, then there are ##3.35## ##mol## ##"H atoms"##.
##"Moles of ammonium hydrogen phosphate"## ##(49.2*g)/(132.06*g*mol^-1)## ##=## ##0.373*mol##. Clearly, there are ##9## ##mol## ##H## per ##mol## ##(NH_4)_2HPO_4##, thus ##3.35*mol## ##"hydrogen atoms"##.
