Q：体系与外界的热量交换；W：体系与外界的功；deltaU：热力学能变化；deltaS：熵变；deltaA：亥姆霍兹自由能变化；deltaG：吉布斯自由能变化。
3.热力学第一定律$$ \Delta U = Q + W $$ 正负号意义:系统从外界吸收热量,Q为正值,系统对外界放出热量,Q为负值;外界对系统做功,W为正值,系统对外界做功,W为负值;△U为正值,系统内能增加;△U为负值,系统内能 减少. 答案 答案见上相关推荐 13.热力学第一定律$$ \Delta U = Q + W $$ 正负号...
为正,Q为负时,NF一定为零 答案 【解析】 【解析】根据公式$$ \Delta l = \beta + Q $$及B、Q、AU的符号法则得A、B、D正确. 【答案】ABD相关推荐 1【题目】在热力学第一定律的表达式$$ A t = W + G $$中,关于Al、 F、Q各个物理数的正,负,下列说法中正确的是( ) A. 物体对外界做与...
Since, the process is isothermal, DeltaU=DeltaH=0 From first law of thermodynamics, DeltaU=q+w=0 q=-w w=-2.30nRTlog((V(2))/(V(1))) =-2.303xx1xx8.314xx400log((20)/(10)) =-2.303xx1xx8.314xx400xx0.3010 =-2305.3J (Work is one by the system)
Step by step video, text & image solution for Find the ratio of (DeltaQ)/(DeltaU) and (DeltaQ)/(DeltaW) in an isobaric process. The ratio of molar heat capacities (C_p)/(C_V)=gamma. by Physics experts to help you in doubts & scoring excellent marks in Class 11 exams.Updated ...
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知识点二热力学第一定律的应用对公式$$ \Delta U = Q + W $$的理解(1)外界对系统做功有助于系统内能的增加,因此,外界对系统做功时,W取正值;而系统对外界做功时,W取负值.(2)外界对系统传递热量有助于系统内能的增加,因此,外界对系统传递的热量Q取正值;而系统向外界传递的热量Q就取负值. 相关知识点:...
(Delta U=W+Q) 中,关于 (Delta U)、 (W)、 (Q) 各个物理量的正、负,下列说法中正确的是___ ` 外界对物体做功时 W 为正,物体从外界吸热时 Q 为负,内能增加时 Δ U 为正`, ` 物体对外界做功时 W 为负,物体从外界吸热时 Q 为正,内能增加时 Δ U 为负`, ` 物体对外界做功时 W 为负,物...
- Substitute the values of Q and W into the equation: ΔU=Q+W ΔU=(+25 kJ)+(−5 kJ) 4. Calculate ΔU: - Perform the addition: ΔU=25 kJ−5 kJ=20 kJ 5. Conclusion: - The change in internal energy (ΔU) of the system is: ΔU=20 kJ Final Answer:The internal energy ...
The first law of thermodynamics was given as q=ΔU+(−w), where q is heat given to a system and ΔU represents increase in internal energy and −w is work done by the system. Various processes such as isothermal, adiabatic, cyclic, isobaric and isochoric process in terms of I law...