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3. What is the gram-formula mass of (NH4)3PO4? A) 112 g/mol B) 121 g/mol C) 149 g/mol D) 242 g/mol
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3. What is the gram-formula mass of (NH4)3PO4?

A) 112 g/mol
B) 121 g/mol
C) 149 g/mol
D) 242 g/mol

User Ugo
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The gram-formula mass means that the mass of one mole molecule. Then you just need to calculate the elements together. So the gram-formula mass of (NH4)3PO4 is equals to (14+4)*3+31+16*4= 149g/mol. So the answer is (c)
User Hassane
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