How many grams of phosphorus are in 500.0 grams of calcium phosphate? a. 310.2 grams b. 49.92 grams c. 130.1 grams d. 99.89 grams?

Option D is correct; 99.89 grams

Explanation:

Calcium phosphate is also known as tricalcium phosphate. The Chemical formula for the compound is Ca3(PO4)2.

The molar mass can be calculated as: 40 × 3 + (31×2) + (16×4)2.

= 120 + 62 + 128.

Molar mass of calcium phosphate= 310 g/mol.

Molar mass of phosphorus is 31 u

From the Chemical formula of calcium phosphate, we can see that we have 2 moles of phosphorus atoms. Therefore, we will have molar mass of phosphorus multiply by 2.

Hence,mass of phosphorus;

===> (31 × 2/ 310 )× 500 gram.

= 62/310× 500 gram.

= 100 grams.

QUICK NOTE: THERE IS SLIGHT DIFFERENCE IN 99.89 AND 100 GRAMS. THIS IS BECAUSE I ONLY USED THE NEAREST SIGNIFICANT VALUE (TO THE LEFT) AFTER THE DECIMAL POINT. FOR EXAMPLE; THE MASS NUMBER OF CALCIUM PHOSPHATE IS 310.177 g/mol and MASS NUMBER OF PHOSPHORUS IS 30.973762 u.

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