题目
题型:不详难度:来源:
A.1:1 | B.2:1 | C.9:17 | D.18:17 |
答案
16 |
18 |
8m |
9 |
质量为n的双氧水H2O2中氧元素的质量=n×
32 |
34 |
16n |
17 |
根据水和双氧水中含有相同质量的氧元素,则
8m |
9 |
16n |
17 |
故选D.
核心考点
举一反三
7 |
30 |
A.
| B.
| C.
| D.
|
A.15.8% | B.20% | C.80% | D.84.2% |
A.a% | B.2a% | C.(100-1.75a)% | D.(1-0.75a)% |
A.1:1 | B.2:1 | C.9:17 | D.18:17 |
16 |
18 |
8m |
9 |
32 |
34 |
16n |
17 |
8m |
9 |
16n |
17 |
7 |
30 |
A.
| B.
| C.
| D.
|
A.15.8% | B.20% | C.80% | D.84.2% |
A.a% | B.2a% | C.(100-1.75a)% | D.(1-0.75a)% |