Question

Select the correct answer.

Sodium phosphate and calcium chloride react to form sodium chloride and calcium phosphate. If you have 379.4 grams of calcium chloride and an excess of sodium phosphate, how much calcium phosphate can you make? Use the periodic table and the polyatomic ion resource.

A.
353.5 g
B.
379.4 g
C.
402.2 g
D.
863.4 g
E.
1,060 g

Answer 1

353.5 g

The balanced equation will be:

2 Na3PO4 + 3 CaCl2 - - - - - - - - - > 6 NaCl + Ca3 (PO4)2

There is 3:1 mole ratio b/w CaCl2 and Ca3(PO4)2

Grams of CaCl2 are converted to mol and these mol are multiplied by the mole ratio to get the mol of Ca3 (PO4)2 . Finally the mol are multiplied by M to get the g of Ca3(PO4)2 .

M of Calcium chloride  = 40.078+2(35.45) = 110.978 g per mol

M of calcium phosphate  = 3(40.078)+2(30.974)+8(16.00)

= 120.234+61.948+128.00 = 310.182 g per mol

= 379.4 x ( 1 / 110.98 ) x ( 1 / 3 ) x ( 310.182 / 1 )

= 353.5 g

Answer 2

Answer: A for plato cuhh

Explanation: