称取12.5g胆矾配成500mL溶液,该溶液中溶质的物质的量浓度是( ) A.0.1mol/L B.0.2mol/L C.0.3mol/L D.0.5mol/L
问题描述:
称取12.5g胆矾配成500mL溶液,该溶液中溶质的物质的量浓度是( )
A. 0.1mol/L
B. 0.2mol/L
C. 0.3mol/L
D. 0.5mol/L
答
12.5g胆矾的物质的量为:
=0.05mol,该溶液中溶质的物质的量浓度为:c=12.5g 250g/mol
=n V
=0.1mol/L,0.05mol 0.5L
故选:A.