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

If you cannot open the file or have any problems, do not rush to leave a negative review! Contact me and I will quickly help you solve the problem. After purchasing, please leave a positive review of the product :)