How many molecules of phosphoric acid H3PO4 contain as many atoms as 10 molecules of ethane C2H6 contain?

1 ethane molecule has 8 C2H6 atoms (2 carbon and 6 oxygen)
This means that 10 ethane molecules contain 80 atoms.
H3PO4 also has 8 atoms (3 hydrogen, 1 phosphorus and 4 oxygen) 3 + 1 + 4 = 8
This means the same number of atoms as 10 ethane molecules contain
C2H6 have 10 phosphoric acid MOLECULES



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