本题目来源于试卷: Models of Matter A.4 The Mole，类别为 IB化学
[单选题]
Calculate the number of moles in 20.5 grams of sodium phosphate $(Na_3PO_4)$.
A. 0.125 mol
B. 1.25 mol
C. 12.5 mol
D. 125 mol
参考答案: A
本题详细解析:
The molar mass of sodium phosphate ; y osjgfa 34cy.y21upis $63.94g mol^{-1}$.Divide the mass (20.5g) of sodium phosphate by the molar mass to calculate the number of moles of the compound. The rest of the choices are incorrect.
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