A.NaCl | B.CaO | C.SO3 | D.NaOH |
10g |
10g+90g |
10g |
10g+90g |
56 |
10g |
74 |
x |
80 |
10g |
98 |
y |
12.25g |
10g+90g |
A. | B. | C. | D. |
A.①②③④⑤ | B.①④⑤ | C.②④ | D.全部 |
A.称取0.5g过氧乙酸、溶于l00g水中 |
B.称取5g过氧乙酸、溶于995g水中 |
C.称取0.5g过氧乙酸、溶于1000g水中 |
D.称取50g过氧乙酸、溶于950g水中 |
A.20% | B.26.5% | C.25% | D.30% |
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