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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".