A.40
B.50
C.60
D.70
A.2.5g/cm3
B.3.0g/cm3
C.2.0g/cm3
D.4.0g/cm3
A.1.33
B.1.37
C.1.38
D.1.50
A.1.35g/cm3
B.1.50g/cm3
C.1.60g/cm3
D.1.70g/cm3
A.1.35g/cm3
B.1.45g/cm3
C.1.50g/cm3
D.1.40g/cm3
A.中等可选
B.难选
C.极易选
D.易选
实验室某些常用的试剂百分浓度及密度分别是:
(1)浓盐酸:含HCl37%,密度1.19g·cm-3.
(2)浓硫酸:含H2SO498%,密度1.98g·cm-3.
(3)浓硝酸:含HNO370%,密度1.42g·cm-3
(4)浓氨水:含NH328%,密度0.90g·cm-3.
试分别计算它们的物质的量浓度.
A.0.95~2.00g/cm3,±0.01g/cm3
B.0.98~1.50g/cm3,±0.01g/cm3
C.0.90~1.00g/cm3,±0.02g/cm3
D.0.96~1.80g/cm3,±0.01g/cm3