chemistry

How do I calculate the average Z molar mass, 1/n (Summation) of n*M given this data: (alternate equation: MZ=Summation N*M^3/Summation N*M^2)

(Ave molar mass, mass of sample):

(7.5,9.6) , (12.5,8.7), (17.5, 8.9), (22.5, 5.6), (27.5, 3.1), (32.5,1.7)

mili moles for repective numbers: 1.3,.7,.51,.25,.11,.052 TOTAL: 2.92

I don't know what numbers to sum

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asked by tom
  1. I don't understand the question. Perhaps another tutor will.

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  2. thanks for taking a look! :)

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    posted by tom

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