1. Mr(СuO)=64+16=80
2.Mr(H2SO4)=2*1+32+16*4=98
3.Mr(Al(OH)3)=27+16*3+1*3=78
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Answers & Comments
1. Mr(СuO)=64+16=80
2.Mr(H2SO4)=2*1+32+16*4=98
3.Mr(Al(OH)3)=27+16*3+1*3=78