The molar mass of Hydrogen is 1.008 g/mol. The molar mass of Phosphorus is 30.974 g/mol. The molar mass of Oxygen is 15.999 g/mol. What is the molecular mass of phosphoric acid?

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87.994 g/mol

97.994 g/mol

77.994 g/mol

17.994 g/mol

answer is C.

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Detailed Solution

molar mass of H3PO4 = Molar mass of 3 Hydrogen (H) atoms + Molar mass of 1 Phosphorus (P) atom + Molar mass of 4 Oxygen (O) atoms.
= (1.008) 3 + 30.974 + (15.999) 4
= 3.024 + 30.974 + 63.996
= 97.994 g/mol

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