H2O Ar(H)=1 Ar(O)=16 Mr(H2O)=18 H3PO4

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вопрос

To calculate the molar mass of H3PO4 (phosphoric acid), we need to first determine the total number of atoms present in the molecule and then multiply by the individual atomic masses.

H3PO4 contains:

3 atoms of hydrogen (H), each with a molar mass of 1
1 atom of phosphorus (P), with a molar mass of approximately 31
4 atoms of oxygen (O), each with a molar mass of 16

Adding these together:

(3 x 1) + 31 + (4 x 16)
= 3 + 31 + 64
= 98

Therefore, the molar mass of phosphoric acid (H3PO4) is 98 g/mol.