12. Propane gas (C,Hs, molar mass is 44.10 g/mol) is typically used as a fuel in
ID: 575438 • Letter: 1
Question
12. Propane gas (C,Hs, molar mass is 44.10 g/mol) is typically used as a fuel in gas grills and a key component in the grilling of bratwurst during the summertime. The combustion reaction of propane is given below C'H,(g) + 502(g) 3C0; (g) + 4 H2O(g) Nr--344 kJ For successful preparation of a bratwurst requires boiling them in a heterogeneous mixture of beer and onions. There fore, one would first need to bring the beer and onions to a boil. Assume the beer (and the onions together) has the same specific heat as water, 4, 182 J g· How many grams of propane would be required to raise the temperature of 1413 grams of beer by 78.0 ?Explanation / Answer
12 )
mass of beer = 1413 g
specific heat = 4.182 J / g oC
temperature = 78.0 oC
Q = m Cp dT
= 1413 x 4.182 x 78
Q = 460914.95 J
Q = 460.9 kJ
delat H = - 2044 kJ
delta H = - Q / n
- 2044 = - 460.9 / n
n = 0.2255
moles of propane = 0.2255
mass of propane = 9.944 g
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