1.(1)m=ρV=1.2g/ml×100ml=120g (2)m酸=1000g×3.6%=36g m浓=36÷36%=100g m水=1000-100=900g2.(1)R1=U/I=9÷1.5=6Ω (2)U2=U总-U1=9-6=3v R2=U2/I2=3÷1=3Ω
