Question

Calculate molecular mass of (Na4)2 . So4

Answer 1

Hello!  

We have the following compound  $(Na_4)_2SO_4$

First step: we multiply the atomic mass by the quantity of the atoms of the compound.

Na = 2*(4*23u) = 2*(92 u) = 184 u

S = 1*(32u) = 32 u

O = 4*(16u) = 64 u

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second step: we add the calculated molecular mass.

184u + 32u + 64u = 280 u ← (answer)

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I Hope this helps, greetings ... Dexteright02! =)