33. Решение задачки по химии №1234

28. Calculate the weight-average and number-average mass (by analogy with the weight-average and number-average molar masses) for the following distribution of the number of particles by mass
N 4 2 27 37 32 26 20 8 3 3 3 1
mi*1012, g 5 6 7 8 9 10 11 12 13 14 15

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