A.①②③ | B.①②③④ | C.①②④ | D.①② |
A.100mL 0.375mol/L MgCl2溶液 | B.200mL 0.25mol/L FeCl3溶液 |
C.50ml 1.5mol/L NaCl溶液 | D.100ml 0.15mol/L NH4Cl溶液 |
A.标准状况下,0.5NA个H2O分子所占体积约为11.2L。 |
B.20g重氧水(H218O)中含有的中子数为8NA |
C.在铁与氯气的反应中,1mol铁失去的电子数为2NA |
D.常温常压下,16gO2和16gO3所含氧原子数都是NA |
A.46:9 | B.16:9 | C.23:9 | D.32:9 |
A.3 :2 :2 | B.1 :2 :3 | C.1 :3 :3 | D.3 :1 :1 |
A.22.85 | B.79.97 | C.159.94 | D.45.69 |
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