Question 81 : xKMnO₄ + yFeS + zH₂SO₄ -> xMnSO₄ + wFe₂(SO₄)₃ + uK₂SO₄ + zH₂O, what is the value of x + y + z + w + u?
1. 60
2. 74
3. 85
4. 98
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Question 82 : 78 grams of benzene is burnt in air, how much water will it produce?
1. 18 grams
2. 36 grams
3. 54 grams
4. 72 grams
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Question 83 : 1 mole of glucose is burnt, how much carbon dioxide will it produce?
1. 44 grams
2. 176 grams
3. 264 grams
4. 352 grams
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Question 84 : Pentane is burnt to produce carbon dioxide 40% of which can be converted into carbon monoxide, how much Butane must be burnt to produce 176 grams of carbon monoxide?
1. 18 grams
2. 36 grams
3. 72 grams
4. 96 grams
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Question 85 : 56 grams of carbon monoxide is oxidized with excess oxygen, how much carbon dioxide will it produce?
1. 22 grams
2. 44 grams
3. 66 grams
4. 88 grams
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Question 86 : 20 grams of CaCO₃ is heated, how much calcium oxide will produce?
1. 5.6 grams
2. 11.2 grams
3. 22.4 grams
4. 44.8 grams
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Question 87 : wC₃H₇O₄ + xO₂ -> yCO₂ + zH₂O, what is the value of w + x + y + z?
1. 21
2. 35
3. 41
4. 47
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Question 88 : wC₃H₆O₃ + xO₂ -> yCO₂ + zH₂O, what is the value of w + x + y + z?
1. 3
2. 6
3. 10
4. 14
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Question 89 : C₅H₁₂ + xO₂ -> yCO₂ + zH₂O, what is the value of x + y*z?
1. 24
2. 38
3. 46
4. 54
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Question 90 : C₂H₄ + xO₂ -> 2CO₂ + yH₂O, what is the value of x + y?
1. 2
2. 3
3. 5
4. 8
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