Acompound with the empirical formula ch2 has a molar mass of 70 g/mol. what is the molecular formula for this compound?

The empirical formula, CH2, has a relative molecular mass of

1×(12.01)+2×(1.01)=14.04

This means that the empirical formula must be multiplied by a factor to bring up its molecular weight to 70. This factor can be calculated as the ratio of the relative masses of the molecular and empirical formulas

7014.04=4.98≈5

Remember that subscripts in molecular formulas must be in whole numbers, hence the rounding-off. Finally, the molecular formula is

C1×5H2×5=C5H10

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.

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