N=0,3×10^23 M=142г/моль m=?

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To calculate the molar mass (m) of a substance, you can use the formula:

m = (M * N) / N_A

where:

M is the molar mass of the substance (142 g/mol in this case)N is the number of molecules or entities (3 x 10^23 in this case)N_A is Avogadro's number (6.022 x 10^23 mol^-1)

Plugging in the values, we get:

m = (142 * 3 x 10^23) / 6.022 x 10^23
m = (426 x 10^23) / 6.022 x 10^23
m = 70.81 g

Therefore, the mass of the substance is 70.81 g.