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Stoichiometric Calculations

What is the m...

Question

What is the molar mass of $C a_{3} (P O_{4})_{2}$ ?

310 g/mol

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154 g/mol

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67 g/mol

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83 g/mol

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115 g/mol

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Solution

The correct option is A 310 g/mol
The atomic masses of Ca, P and O are 40, 31.0 and 16.0 g/mol respectively.
The molar mass of $C a_{3} (P O_{4})_{2} = 3 (40) + 2 (31.0 + 4 (16.0)) = 120 + 2 (31.0 + 64.0) = 120 + 2 (95.0) = 120 + 190 = 310$ g/mol.

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