Răspuns:
a) MNaOH=23+16+1=40g/mol
n=m/M=32/40=calculeaza
b) MCuSO4=64+32+4x16=160kg/kmol
n=m/M=14,4/160=calculeaza
c) V = 1,8L H2O
ρ=1kg/L
MH2O = 2MH + MO = 2*1 + 16 = 2+16 = 18 g/mol
mH2O = Vxρ = 1,8x1 = 1,8kg = 1800g H2O
n = m/M = 1800/18 = calculeaza
Explicație: