For the following reaction, determine the number of electrons transferred. If the reaction is not a...

For the following reaction, determine the number of electrons transferred. If the reaction is not a redox reaction, please enter “0” for your answer.

3CuS(s)+8HNO3(aq) = 3CuSO4(aq)+8NO(g)+4H2O(l)

Solutions

Expert Solution

number of electrons transferred = 24

Explanation

The balanced reaction is : 3 CuS (s) + 8 HNO₃ (aq) 3 CuSO₄ (aq) + 8 NO (g) + 4 H₂O (l)

We have to check the oxidation number of each element before and after reaction

Before reaction
Compound	element	oxidation number
CuS	Cu	+2
CuS	S	-2
HNO₃	H	+1
	N	+5
	O	-2
After reaction
Compound	element	oxidation number
CuSO₄	Cu	+2
	S	+6
	O	-2
NO	N	+2
NO	O	-2
H₂O	H	-1
H₂O	O	+2

From the table, we see that oxidation number of sulfur changes from -2 to +6

This means each sulfur atom loses 8 electrons.

Since there are 3 sulfur atom in the balanced equation, therefore, total atoms lost by sulfur = 3 * 8 = 24 electrons

queen_honey_blossom answered 1 year ago

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