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Question

The reaction of burning of carbon in oxygen is represented by equation:C(s)+O2(g)⟶CO2(g)+ Heat + Light When 9.0g of solid carbon is burnt in 16.0g of oxygen gas, 22.0g of carbon dioxide gas formed on burning of 3.0g of carbon in 32.0g of oxygen would be: (Note : atomic mass of C=12.0u,O=16.0u)

A
16.60g
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B
7.33g
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C
8.25g
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D
11.00g
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Solution

The correct option is C 11.00gGiven, Weight of carbon =3 g.Atomic mass of carbon =12 g.∴ Moles of carbon = 14.Weight of oxygen=32 g.Atomic mass of oxygen=16 g.∴ Moles of oxygen = 3232 = 1Now out of 1 mole of oxygen, 14 mole will react with 14 mole of carbon.∴Mass of CO2=3+14×32=11g.

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