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Question

An enclosure of volume 3 litre contains 16g of oxygen, 7g of nitrogen and 11g of carbondioxide at 27$$^o$$C. The pressure exerted by the mixture is approximately


A
9 atmosphere
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B
8.3 atmosphere
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C
3 atmosphere
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D
1 atmosphere
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Solution

The correct option is B 8.3 atmosphere
Total number of moles = number of moles of oxygen + number of moles of nitrogen + number of moles of carbon-di-oxide
$$\dfrac { 16 }{ 32 } +\dfrac { 7 }{ 14 } +\dfrac { 11 }{ 44 } =1mole$$
Molecular weight of Carbon-di-oxide = 44g
Molecular weight of Oxygen =32g
Molecular weight of  nitrogen=14g
Using ideal gas equation,
$$P=\dfrac { nRT }{ V } =\dfrac { 1 \times8.3 \times300 }{ (3\times{ 10 }^{ -3 }) } =8.3atm(nearly)$$
Hence, Option B is correct.


Physics

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