Take home Disc Your Name:-Marissa-radussionQuiz #9 TF\'s name Discussion /day Ti

Question

Take home Disc Your Name:-Marissa-radussionQuiz #9 TF's name Discussion /day Time:B 1. ( 1 points) write the chemical reaction for which ar-4All H2022Mf(CH3OH, g) + 2AgH (CO2, g) 2. (1 point) The reaction 2 CH4(g) + Odg) 2 HsCOH(g) is exothermic. Write down the expression for the bond enthalpy of Oa, in terms of A.H and the following bond enthalpies 1MC-H), 1C-O), and AMO-H). AsH(0-0) = 3. (1 point) The enthalpy of formation of coal, AfrIC(coal,s), is-10. kJ/mol and the enthalpy of formation of carbon monoxide, Ad [CO(g)] is-110. kJ/mol. When 10. moles of coal is burned to form carbon monoxide, 850 kJ of heat is released. Calculate the percent yield of the reaction. (lpoints) If q-12.00 J and w --3,00J. If the heat capacity is 3.000and we have a 1.000g 4. g.K sample with the initial temperature at 300.00K, what would the final temperature be if the reaction is run at (1) constant pressure and (2) constant volume? Thal (at constant volume)

Explanation / Answer

Q1

Recall that

HRxn = Hproducts- HReactants

so...

positive values --> 4*H2O(l) and 2*CO2

negativ evales --> 2*CH3OH(g)

then

2*CH3OH(g) --> 4*H2O(l) + 2*CO2(g)

this is most likely the combustion of methanol

Q2

HRxn = Hformed - Hbroken

2CH4 = 2*4(C-H)

O=O = 1xO=O

C-H = 2*3x = 6x

C-O = 2*1x = 2x

O-H = 2*1x = 2x

HRxn = [2x(O-H) + 2x(C-O) + 6x(C-H)] - [8x(C-H) + O=O]

simplify

HRxn = [2x(O-H) + 2x(C-O) ] - [2x(C-H) + O=O]

solv efor O=O

O=O =  [2x(O-H) + 2x(C-O) ] - [2x(C-H)] - HRxn

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