Concept explainers
Interpretation:
The number of moles in 4.30×102g of calcium phosphate (Ca3(PO4)2) needs to be determined.
Concept introduction:
Molar mass is the grams per mole of a certain molecule.
Molar mass = MassNumber of moles …… (1)

Answer to Problem 10STP
B. 1.39 moles
Explanation of Solution
From the formula (1) of molar mass,
Mass = Molar mass×Number of moles …… (2)
MassMolar mass= Molar massMolar mass×Number of moles
(Multiply both sides by number of moles)
Number of moles = MassMolar mass …… (3)
Molar mass of calcium is 310.18g/mol. Given mass is 4.30×102g
Put these values in equation (3) is as follows:
Number of moles = 4.30×102g310.18g/mol= 1.386 mol≈ 1.39 mol
Thus the moles are in 4.30×102g of calcium phosphate (Ca3(PO4)2) is 1.39 moles. The correct option is B.
The incorrect options are as follows:
A. 0.721 moles
The formula of molar mass is as follows:
Mass = Molar mass×Number of moles
C. 1.54 moles
The formula of molar mass is as follows:
Mass = Molar mass×Number of moles
D. 3.18 moles
The formula of molar mass is as follows:
Mass = Molar mass×Number of moles
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