A sample of NI3 is contained in a piston and cylinder. The samples rapidly decomposes to form nitrogen gas and iodine gas, and releases 3.30

Question

A sample of NI3 is contained in a piston and cylinder. The samples rapidly decomposes to form nitrogen gas and iodine gas, and releases 3.30 kJ of heat and does 950 J of work. What is ∆E?

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Cherry 3 years 2021-08-26T04:40:42+00:00 1 Answers 45 views 0

Answers ( )

  1. MichaelMet
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    2021-08-26T04:42:24+00:00
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    Answer:

    -2.35 kJ

    Explanation:

    The energy change of the NI3 sample, ΔE = Q + W. where Q = quantity of heat and W = workdone. After decomposing to form nitrogen gas and iodine gas,  3.30 kJ of heat is released, Q = -3.30 kJ and since the sample does work of 950 J, W = +950 J = + 0.950 kJ.

    ΔE = Q + W = -3.30 kJ + (+ 0.950 kJ) = -3.30 kJ + 0.950 kJ = -2.35 kJ

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