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Question

8H++3CuS+8NO33SO42+3Cu2++8NO+4H2O
(Atomic weights: CuS=96;NO=30)
If 200 g of CuS are consumed, then approximately how many grams of NO are produced?

A
166 g
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B
400 g
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C
232 g
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D
200 g
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Solution

The correct option is A 166 g
From the above equation, it is clear that 3 moles of CuS produce 8 moles of NO.
Molecular weight of CuS is 96grams. Thus, 3 moles of CuS weigh (3×96) that is 288grams
Molecular weight of NO is 30grams. Thus, 8 moles of NO weigh (8×30) that is 240grams
Thus it can be said,
288grams of CuS produce 240grams of NO
1gram of CuS produce 240288grams of NO
200grams of CuS will produce 240288×200 that is 166grams of NO. We can consider it to be approximately 160grams
Thus, Option E is the correct answer.

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