(1)溶液的质量=
12.5g
5% =250g,溶剂的质量=250g-12.5g=237.5g,故答案为:237.5;
(2)溶液的密度=
250g
250ml =1g/ml,故答案为:1;
(3)溶质的物质的量为
12.5g
180g/mol =0.069mol,物质的量浓度为
0.069mol
0.25L =0.28mol/L,故答案为:0.28mol/L.
(1)溶液的质量=
12.5g
5% =250g,溶剂的质量=250g-12.5g=237.5g,故答案为:237.5;
(2)溶液的密度=
250g
250ml =1g/ml,故答案为:1;
(3)溶质的物质的量为
12.5g
180g/mol =0.069mol,物质的量浓度为
0.069mol
0.25L =0.28mol/L,故答案为:0.28mol/L.