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21 May, 22:23

What is the gram-formula mass of (NH4) 3PO4? (1) 112g/mol (2) 121g/mol (3) 149g/mol (4) 242g/mol

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  1. 22 May, 01:37
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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 (3).
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