Question

what is molecular formulae?what is valency?give examples

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Answer 1

Answer:

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Answer 2

Answer:

For example, the molecular formula of butene, C4H8, shows that each freely existing molecule of butene contains four atoms of carbon and eight atoms of hydrogen. Its empirical formula is CH2. One molecule of ethylene (molecular formula C2H4) contains two atoms of carbon and four atoms of hydrogen.

The number of atom losed or gained by a atom of an element is called valency.example of valency are like the valecy of hydrogen is 1.