We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive pseudonymised information about your use of our website. cookie policy and privacy policy.
 
+0  
 
0
113
1
avatar
  1. Given the following equations, calculate the ΔH of reaction of ethylene gas (C2H4) with fluorine gas to make carbon tetrafluoride (CF4) gas and hydrogen fluoride gas. Show your work.

H2 (g) + F2 (g) → 2HF (g)                        ΔH = –537 kJ

C (s) + 2F2 (g) → CF4 (g)                        ΔH = –680 kJ

2C (s) + 2H2 (g) → C2H4 (g)                    ΔH = +52.3 kJ

 Apr 18, 2019
 #1
avatar+18840 
+2

First balance the equation

                           C2H4---> 2C+ 2H2

C2H4  +  6 F2 ---------------------------------->  2 CF+  4 HF   

                                                                    Note that we got 4 HF's   Given 2 HF's = - 537kj       - 537 x 2

                                                                                   we got 2 CF4     Given 1 CF4 = - 680 kj       - 680 x 2

                                                                                                                                                      ___________

                                                                                                                                        deltaH = - 2434kj

                                                                                            But I will assume the intermediate reaction occurs too:

                                                                                   C2H4 -----> 2C + 2H2    we have ONE of these reactions  for  - 52.3 kj

        deltaH becomes - 2434 - 52.3 kj =  -2486.3 kj

 Apr 18, 2019
edited by Guest  Apr 18, 2019
edited by ElectricPavlov  Apr 20, 2019

29 Online Users

avatar
avatar