选A.
题目中最后的体积相同,看物质的量即可,物质的量大的浓度大.
A.物质的量是n=cV=3*0.02=0.06mol
B.物质的量是n=cV=2*0.02=0.04mol
C.物质的量是n=cV=4*0.01=0.04mol
D.物质的量是n=cV=2*0.01=0.02mol
选A.
题目中最后的体积相同,看物质的量即可,物质的量大的浓度大.
A.物质的量是n=cV=3*0.02=0.06mol
B.物质的量是n=cV=2*0.02=0.04mol
C.物质的量是n=cV=4*0.01=0.04mol
D.物质的量是n=cV=2*0.01=0.02mol