Question

M (Na2So4)= 28.4 г N-?

Answer 1

m = 28.4 (г)

M(Na2SO4) = 2*23+32+4*16= 142(г/моль)

n=m/M = 28.4/142 = 0.2 (моль)

N=Na*n, где Na - число Авогадро = 6.02*10^23 (молекул/моль)

N = 6.02*10^23*0.2 = 1.204*10^23 (молекул)

Answer 2

To calculate the molar mass of an unknown substance (N), we need additional information or the chemical formula of that substance. Without the chemical formula, we cannot determine the molar mass or provide any meaningful answer.

If you have the chemical formula of substance N, please provide it, and I'll be happy to help you calculate its molar mass.