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cate grame de hidroxid de natriu se gasesc in 2,5 moli

Răspuns :

M,NaOH= (23gNa+16gO+1gH)= 40g/mol
1mol.........40g
2,5mol........x........................calculeaza !!!!
MNaOH= ANa+AO+AH=23+16+1= 40g/mol
1mol.........40g
2,5mol........xg
x=2,5×40/1=calculeaza