What will the final temperature of 400 mL sample of water at 39.2Â°C be if 36,555...

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Chemistry

What will the final temperature of 400 mL sample of water at39.2Â°C be if 36,555 J of heat were added.
a.88.1Â°C
b.58.2Â°C
c.77.0Â°C
d.61.0Â°C
How much heat is produced when 6.26g of zinc metal reacts withoxygen gas under standard conditions? Use standard enthalpies offormation provided in your textbook.
a. 35.5 kj
b.267 kj
c.1021 kj
68.7 kj
Ethanol, C2H5OH, is used as a primary fuel for motor vehicles insome countries like brazil,The balanced chemical equation for thecombustion reaction is
C2H5OH(l) + O2(g)-------- CO2(g) + H2O(g)
The density of the ethanol is 0.7893g/mL .Determine the enthalpyof combustion of exactly 2L of ethanol.
a. -3.31 x 10^4 kj
b.-4.68 x 104
c.-1.11 x 104 kj
d.1.69 x 10^4 kj

Answer & Explanation Solved by verified expert

4.5 Ratings (700 Votes)

AnswerIGivenvolume of water V 400 mLHeat energy q 36555 JInitial temperature Tinitial 392 0CFinal temperature Tfinal Since we know thatdensity of water d 10 g mLspecific heat of water C 418 J g0CAs we know thatmass m volumeV densitydSomass of water m volume of water V density of water dmass of water m 4000 mL 10 g mLmass of water m 4000 gAccording to formulaHeat energy q mass of water m specific heat of water C change in temperature THeat energy q mass of water m specific heat of water C change in temperatureFinal temperature Tfinal Initialtemperature Tinitial 36555 J 4000 g 418 J g0C Tfinal 392 0C36555 J 16720 J 0C Tfinal 392 0CTfinal 392 0C 36555 J 16720 J0CTfinal 392 0C 36555 J 16720 J0CTfinal 392 See Answer

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