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b)m(Na2S)=2*23u + 32u = 46u + 32u=78u
c)m(H3PO4)= 3*1u+31u + 4*16u=3u + 31u + 64u= 98u
m Na₂S = 23u*2 + 32u = 78u
m H₃PO₄ = 3*1u + 31u + 64u = 98u
16u*2 = 32 u
Na2S
2*23u+ 1*32u= 46u+32u= 78
H3PO4
3*1u+1*31u+4*16u= 3u+31u+ 64= 98u