Ccl, 189.85 g/mol. find the molecular formula

We do as follows:

Cl = 35.45 
C = 12.01 
C + Cl = 47.46 g / mol of cl and c atoms 
189.85 / 47.46 g = 4 so multiply the empirical formula by 4 to get 

C4Cl4

Hope this answers the question. Have a nice day.

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Adozen is 12, and your needing to calculate the weight of one medium egg, so i would do 21/12=1.75 per egg, and check your answer by doing 1.75 * 12= 21 : ) : ): ): ): ) i hoped i