mvtthewisdead

01.02.2020 • 

Chemistry

Abomb calorimeter, or a constant volume calorimeter, is a device often used to determine the heat of combustion of fuels and the energy content of foods. in an experiment, a 0.9973 g sample of isophthalic acid (c8h6o4) is burned completely in a bomb calorimeter. the calorimeter is surrounded by 1.319×103 g of water. during the combustion the temperature increases from 25.37 to 28.49 °c. the heat capacity of water is 4.184 j g-1°c-1. the heat capacity of the calorimeter was determined in a previous experiment to be 939.3 j/°c. assuming that no energy is lost to the surroundings, calculate the molar heat of combustion of isophthalic acid based on these data.

Ответ:

andreastyles1603

17.01.2022

Chemistry

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find heat released by the burn:  

(2 g) (19.4 kJ/g) = 38.8 kJ released  

find heat gained by the water:  

dH = m C dT  

dH = (2250 g) (4.184 J/g-C) (+ 3.17 C)  

dH = 29,842 Joules  

aka  

dH water = + 29.8 kJ  

find the missing heat given to the calorimeter  

(38.8 kJ released) - (29.8 kJ given to water) = 9.0 kJ given to calorimeter  

What is the heat capacity of the empty bomb calorimeter  

(9.0 kJ given to calorimeter) / (3.17 C rise in temp) = 2.84 kJ / C

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Ответ:

kyleighmarie05

12.09.2022

Chemistry

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1 is b 2 is a 3 is d 4 is a 5 is c

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