AP Chemistrymediummcq1 pt
What is the molar mass of ammonium phosphate, (NH₄)₃PO₄?
A.149.1 g/mol
B.113.0 g/mol
C.85.1 g/mol
D.118.1 g/mol
Explanation
Core Concept
Subscripts outside parentheses multiply everything inside: three ammonium ions contribute 3 N and 12 H, and the phosphate adds 1 P and 4 O. The total is 42.03 + 12.10 + 30.97 + 64.00 = 149.1 g/mol. Forgetting to distribute the outer 3 over hydrogen is the classic slip here.
Correct Answer
A149.1 g/mol
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