ХИМИЯ 8 КЛАСС

помогите, пожалуйста, решить, а то я ничего не понимаю :(
Mr(Na₂CO₃) =
Mr(Al(NO₃)₃) =
Mr(ZnSO₄) =
Mr(Al₂(SO₄)₃) =
Mr(AgNO₃) =
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