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Which pair consists of a molecular formula and its corresponding empirical formula? (1) C2H2 and CH3CH3 (3) P4O10 and P2O5 (2) C6H6 and C2H2 (4) SO2 and SO3
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Which pair consists of a molecular formula and its corresponding empirical formula?

(1) C2H2 and CH3CH3 (3) P4O10 and P2O5
(2) C6H6 and C2H2 (4) SO2 and SO3

User Richard De Ree
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3 because 4 divided by 2 is 2 (P2) and 10 divided by 2 is 5 (O5) which reduces P4O10 to P2O5
User Dan Newton
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3) P4O10 and P2O5
The mass of the P4O10 divided by the mass of the P2O5=2, and if you multiply the number of atoms in the P2O5 by 2, you get the P4O10, thus P2O5 is its empirical formula.
User GChuf
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