Masteringchemistry: post-Lecture Homework Chapter 15 Google Chrome Secure https:

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Masteringchemistry: post-Lecture Homework Chapter 15 Google Chrome Secure https: SPRING 2017 CHE 102 1555 Post-Lecture Homework Chapter 15 tem 1 For the reaction Item 1 2CH4(g) C2H2(g) +3H2 (g) K 0.170 at 1648 0C. What is Kp for the reaction at this temperature? For chemical reactions involving ideal gases, the Express your answer numerically. equilibrium constant K can be expressed either in terms of the concentrations of the gases (in M or as a function of the partial pressures of the gases (in atmospheres In the latter case, the equilibrium constant is denoted as Kp to distinguish it from the concentration-based equilibrium constant K. Submit Hints My Answers Give Up Review Part Part B For the reaction N2 (g)+ 3H2 (g) 2NH3(g) Kp 3.55x10 at 299 °C. what is K for the reaction at this temperature? Enter your answer numerically. Submit Hints My Answers Give Up Review Part Type here to search Help Close Resources previous l 1 of 6 l next 6 AM 4/25/2017

Explanation / Answer

KC and Kp are related as Kp =KC*(RT) deltan, where deltan= change in no of moles of gases during the reaction for the reaction 2CH4 (g)<---->C2H2 (g)+3H2 (g)= 1+3-2= 2

R=0.0821 L.atm/mole.K and T= 1648deg.c= 1648+273=1921K

Kp= 0.170*(0.0821*1921)2= 4228.535

2. for the reaction, deltan= 2-1-3=-2, T= 299deg.c= 299+273= 572K, R =0.0821 L.atm/mole.K

Kp= KC*(RT)deltan, 3.55*10-3= KC*(0.0821*572)-2, KC=7.83

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