The chemical formula for cupric phosphate is Cu3 (PO4)2. Determine the following

Question

The chemical formula for cupric phosphate is Cu3 (PO4)2. Determine the following: A) the number of atoms in two formula units of Cu3 (PO4)2. B) the mass of 2.75 mol of Cu3 (PO4)2. C) the number of moles of Cu3 (PO4)2 in 37.2 g of Cu3 (PO4)2. D) the mass in grams of 4 formula units of Cu3(PO4)2 The chemical formula for cupric phosphate is Cu3 (PO4)2. Determine the following: A) the number of atoms in two formula units of Cu3 (PO4)2. B) the mass of 2.75 mol of Cu3 (PO4)2. C) the number of moles of Cu3 (PO4)2 in 37.2 g of Cu3 (PO4)2. D) the mass in grams of 4 formula units of Cu3(PO4)2 A) the number of atoms in two formula units of Cu3 (PO4)2. B) the mass of 2.75 mol of Cu3 (PO4)2. C) the number of moles of Cu3 (PO4)2 in 37.2 g of Cu3 (PO4)2. D) the mass in grams of 4 formula units of Cu3(PO4)2

Explanation / Answer

Ans A. Two formula units of Cu3(PO4)2 has 6 atoms of copper , 4 atoms of phosphorous and 16 atoms of oxygen.

B. Mass of 1 mol of cupric phosphate is 380.59 g

So 2.75 mole = 2.75 × 380.59 = 1046.62 g

C. Number of moles in 37.2 g of cupric phosphate will be,

37.2 / 380.59 = 0.098 moles

D. Formula unit mass of cupric phosphate is 380.59 amu

So the mass of 4 formula units will be 4 × 380.59 amu = 1522.36 amu

1 amu = 1.66 × 10-24 g

So 1522.36 amu = 1522.36 × 1.66 × 10-24 g = 2.53 × 10-21 g

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