2. An alkane has a relative molecular mass of 58, determine its molecular formula.

C4H10.

Explanation:

The general formula for an alkane is CnH(2n+2).

C = 12 and H = 1  (Molecular masses).

So we have the equation:

12n + 2n + 2 = 58

14n = 56

n = 4.

So the formula is  

C4H(2*4+2)

= C4H10.

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in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

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