Answer:
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.
