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ChunHo

2008-01-02 11:54 pm

Referring to the following chemical equation,
a MnO2 + b PbO2 + c H+  d MnO4- + f Pb2+ + g H2O
Which of the following is correct?

更新1:

A.a = 2, b = 7, c = 4, d = 8, f = 1, g = 4 B.a = 2, b = 6, c = 4, d = 4, f = 3, g = 2 C.a = 2, b = 3, c = 4, d = 2, f = 3, g = 2 D.a = 2, b = 3, c = 4, d = 3, f = 3, g = 3

回答 (2)

用戶221652

2008-01-03 1:01 am

✔ 最佳答案

1) No. of Mn in MnO2 and MnO4- should be the same, therefore a = d
2) No. of Pb in PbO2 and Pb2+ should be the same, therefore b = f
3) No. of H+ should be twice of no. of H2O, therefore c = 2g

Thus, C is correct.

參考: me

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David

2008-01-03 12:59 am

C is the answer.

The number of element on both sides should be the same and charges should be balanced as well. When you look at the Mn, if a=2 then d=2 as well. So the only answer is C.

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