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70 calories of heat required to raise th...

70 calories of heat required to raise the temperature of 2 moles of an ideal gas at constant pressure from `30^@Cto 35^@C.` The amount of heat required (in calories) to raise the temperature of the same gas through the same range `(30^@C to 35^@C)` at constant volume is:

A

`30 cal`

B

`50 cal `

C

`70 cal `

D

`90 cal `

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