V1 = 100 mL, c1 = 25%, ρ=1,176 g/cm3
V2 = 100 mL, C2 = 1M
V3 = 200 mL H2O
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msol1 = V1 * ρ = 100 * 1,176 = 117,6g
c1 = md1*100/msol1 => md1 = c1*msol1/100 = 25*117,6/100 = 29,4g H2SO4
C2 = n/V = md2/V*M => md2 = C2*V*M = 1*0,1*98 = 9,8g H2SO4
mdf = md1 + md2 = 29,4 + 9,8 = 39,2g H2SO4
Vf = V1+V2+V3 = 100+100+200 = 400 mL = 0,4 L
Cf = mdf/Vf*M = 39,2/0,4*98 = 1M => b este corect