Question

Is it always true that the molecules of a dense liquid are heavier than the molecules of a lighter liquid?

Answer 1

no it is not true always
eg
water has a density greater than gasoline ,but gasoline,octane, anyway,has a greater molecular mass than water molecules

hope it will help you

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Answer 2

Answer ⇒ No.

Explanation ⇒ No, it is not always true that the molecules of the dense liquid are heavier than the molecules of the lighter liquid.

This is because, density does not depends upon the weight of the molecules.

Also, the arrangement of the molecules is independent on the weight and it depends upon the density.

If the liquid is dense, this means, molecules are closely packed. This does not tells the weight.

It is also possible that the liquid which is diluted may have the same weight.

Hope it helps .