Answer
98 g = Molar Mass of H3PO4
Work Step by Step
H3 PO4 factors into 1/3, 1/3, 16(4)
From this point, use Stoichiometry
3 mol H x 1.0 g H/1 mol H= 3.0 g H + 31.0 g P + 64 g O (Mass of the elements)
= 98 g
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