C=m/M*(20/250)/18.30*1000=1.9221/74.5*0.08/18.30*1000=0.1128
濃鹽酸的體積為100*9%*0.3/1.2*36%=6.25ml 此鹽酸的M為100*0.3*10/36.5=7.40M