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Verified answer
ZnO=65+16=81u
Na_(2)O=46+16=62u
K_(2)CO_2=39×2+12+16×3=17+12+48=138u
Answer:
Zn0=65+16=81u.
Na_(2)0=46+16=62u.
K_(2)CO_2=39×2+12+16×3=17+12+48=138u.