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Thermodynamics

Question
CBSEENCH11006158
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The enthalpy change (∆H) for the reaction
                straight N subscript 2 left parenthesis straight g right parenthesis space plus space 3 straight H subscript 2 left parenthesis straight g right parenthesis space space rightwards arrow space space 2 NH subscript 3 left parenthesis straight g right parenthesis
is -92.38 kJ at 298 K. what is the increment straight U at 298 K?

Solution

    Here comma space space space increment straight H space equals space minus 92.38 space kJ space equals space 92380 space straight J space space space space space space space space space space space space space space straight R space equals space 8.314 space JK to the power of negative 1 end exponent space mol to the power of negative 1 end exponent space space space space space space increment straight n subscript straight g space equals space 2 minus left parenthesis 1 plus 3 right parenthesis space equals space minus 2 space space space space space space space space straight K space equals space 298 we space know space that space increment straight H space equals space increment straight U plus space increment straight n subscript straight g RT
Substituting the values, we have,
     negative 92380 space equals space increment straight U space plus space left parenthesis negative 2 right parenthesis thin space left parenthesis 8.314 right parenthesis thin space left parenthesis 298 right parenthesis or space space minus 92380 space equals space increment straight U minus 4955

or space space space space space space increment straight U space equals space minus 92380 space plus space 4955 space space space space space space space space space space space space space space space equals negative 87425 space straight J space space space space space space space space space space space space space space space equals space minus 87.425 space kJ

Some More Questions From Thermodynamics Chapter

Define state variables of a system.

From thermodynamic point of view, to which system the animals and plants belong?

What is a state function?

A thermodynamic state function is a quantity

What is reversible process in thermodynamics?

Define irreversible change.

Name the variable that is kept constant in isochoric process and isobaric process.

Give one difference between an isothermal and an adiabatic process.

For the process to occur under adiabatic conditions, the correct condition is

Define internal energy of a system

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