A.m=160n/250 | B.m=1600n/(2500+9n) |
C.m=1600n/(2500+16n) | D.m=1600n/(2500+25n) |
m |
100+m |
| ||
100+n |
1600n |
2500+9n |
A.50ml、50g | B.45.5ml、50g |
C.55ml、40.5g | D.45.5ml、54.5g |
A.4% | B.4.2% | C.4.4% | D.5% |
A.100g水中溶解有10g氢氧化钠 |
B.10g溶液中含有1g氢氧化钠 |
C.溶液中溶质质量与溶剂质量的比为1:9 |
D.把5g氢氧化钠固体溶解在45g水中,可制成10%的氢氧化钠溶液 |
A.溶质:溶液=1:1 |
B.溶质:溶剂=1:1 |
C.溶剂:溶液=1:1 |
D.饱和溶液的质量一定为200g |
A.加入10g硝酸钾 | B.加人20g硝酸钾 |
C.蒸发45g水 | D.蒸发50g水 |
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