M (Na2So4)= 28.4 г N-?

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вопрос

To find the number of moles of Na2SO4 with a given mass of 28.4 g, we need to divide the mass by the molar mass of Na2SO4.

The molar mass of Na2SO4 is calculated as follows:
2(Na) + 1(S) + 4(O) = 2(22.99 g/mol) + 32.06 g/mol + 4(16 g/mol) = 46 + 32.06 + 64 = 142.06 g/mol

Now, divide the given mass by the molar mass to find the number of moles:
28.4 g / 142.06 g/mol = 0.2 moles

Therefore, there are 0.2 moles of Na2SO4 in 28.4 grams of the compound.