The phosphoric acid molecule contains three hydrogen atoms, one phosphorus atom and four
| September 27, 2021 | education
The phosphoric acid molecule contains three hydrogen atoms, one phosphorus atom and four oxygen atoms. Find the relative molecular weight of this substance.
Given:
H3PO4 – phosphoric acid
Find:
Mr (H3PO4) -?
1) Using the periodic system of D.I.Mendeleev, calculate the relative molecular weight of orthophosphoric acid:
Mr (H3PO4) = Ar (H) * N (H) + Ar (P) * N (P) + Ar (O) * N (O) = 1 * 3 + 31 * 1 + 16 * 4 = 98.
Answer: The relative molecular weight of phosphoric acid is 98.
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