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3 years ago

What is the oxidation number of chlorine in HClO4?

Chemistry

1 answer:

Elza [17]3 years ago

8 0

CIO4-=-1

CI=4O=-1

O has a 2- oxidation change so

CI+4(-2)=-1

CI+(-8)=-1

CI=-1+8=7

So the oxidation number of chlorine is 7 in this case

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3 years ago

Consider the following reaction. 3 Fe(s) + 4 H2O(g) Fe3O4(s) + 4 H2(g) At 900°C, Kc for the reaction is 5.1. If 0.050 mol of H2O

Oduvanchick [21]

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Hello,

In this case, considering the given reaction:

$3 Fe(s) + 4 H_2O(g) \rightleftharpoons Fe_3O_4(s) + 4 H_2(g)$

Thus, for the equilibrium, just water and hydrogen participate as iron and iron(II,III) oxide are solid:

$Kc=\frac{[H_2]^4}{[H_2O]^4}$

Thus, at the beginning, the concentration of water is 0.05 M and consequently, at equilibrium, considering the ICE procedure, we have:

$5.1=\frac{(4x)^4}{(0.05M-4x)^4}$

Thus, the change $x$ is obtained as:

$\sqrt[4]{5.1} =\sqrt[4]{[\frac{(4x)}{(0.05M-4x)}]^4}\\\\1.5=\frac{(4x)}{(0.05M-4x)}\\\\x=0.0075M$

Thus, the moles of hydrogen at equilibrium are:

$[H_2]_{eq}=4*0.0075\frac{mol}{L}*1.0L=0.03molH_2$

Therefore, the grams of iron(II,III) oxide finally result:

$m_{Fe_3O_4}=0.03molH_2*\frac{1molFe_3O_4}{4molH_2}*\frac{231.533gFe_3O_4}{1molFe_3O_4} \\m_{Fe_3O_4}=1.7gFe_3O_4$

Best regards.

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3 years ago