Calculate the mass fractions of elements in the following compound Ca3 (PO4) 2
| November 25, 2020 | education
Compound elements: Ca, P and O (calcium, phosphorus, and oxygen)
Their atomic masses are 40, 31 and 16
Find the molar mass of calcium phosphate. Let’s add the atomic masses of the elements, taking into account the indices:
40 * 3 + 31 * 2 + 16 * 8 = 310
w (Ca) = 40 * 3/310 = 0.39 * 100% = 39%
w (P) = 31 * 2/310 = 0.2 * 100% = 20%
w (O) = 16 * 8/310 = 0.41 * 100% = 41%
Answer: 39%; 20%, 41%.
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