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Ratio of change in internal energy of a substance from 4^oC to T and from T to 10^oC is 2, what is T?

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Ratio of change in internal energy of a substance from 4^oC to T and from T to 10^oC is 2, what is T?

(a) 5^oC

(b) 6^oC

(c) 7^oC

(d) 8^oC

I have been asked this question by my school teacher while I was bunking the class.

Enquiry is from Internal Energy and Energy Conversion Concept topic in portion Introduction to Energy Balances for Processes without Reaction and Calculation of Enthalpy Changes of Basic Chemical Engineering

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Correct option is (d) 8^oC

The best explanation: 2 = (T – 4)/(10 – T), =>  T = 8^oC.

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