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calculeaza masa fiecarei substante luate in cantitatea de substanta de 10 mol:
H2O


Răspuns :

MH2O=2AH+AO=2*1+16=18g/mol

n=10 moli H2O

n=m/M=>m=n*M=10*18=180g H2O
1mol H2O........18g 10moli..................x X= 18*10/1= 180g