A piece of NH4Cl is kept inside a ballon filled with some air, having thermally insulated walls. The temperature is kept just above sublimation temperature of NH4Cl. \left(NH\right)_{4} Cl \left(\right. s \left.\right) \overset{\textrm{ }\text{sublime}\textrm{ }}{\rightarrow} \left(NH\right)_{3} \left(\right. g \left.\right) + HCl \left(\right. g \left.\right) Which of the following is correct regarding this :

Engineering

Chemistry

Entropy Calculations

Question

A piece of NH₄Cl is kept inside a ballon filled with some air, having thermally insulated walls. The temperature is kept just above sublimation temperature of NH₄Cl.

${NH}_{4} Cl (s) \overset{sublime}{⟶} {NH}_{3} (g) + HCl (g)$

Which of the following is correct regarding this :

ΔU = negative

w = zero

q_system = positive

ΔU = positive

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