The variables for this experiment include the physical properties of the solutions and the pH of each solution. Use the drop-dow
n menus to complete the sentences and identify the independent and dependent variables. The independent variable, the one that is intentionally manipulated, is . a)the pH of the solutions b) the physical properties c) the system of measurement The dependent variable, the one that you measure the response in, is . a) the pH of solutions b) the physical properties c) the system of measurement
2 answers:
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Answer : The heat of combustion per mole of caffeine at constant volume is 76197.18 kJ/mole
Explanation :
First we have to calculate the specific heat calorimeter.
Formula used :
where,
Q = heat of combustion of benzoic acid = 26.38 kJ/g = 26380 J/g
m = mass of benzoic acid = 0.235 g
c = specific heat of calorimeter = ?
= change in temperature =
Now put all the given value in the above formula, we get:
Thus, the specific heat of calorimeter is
Now we have to calculate the heat of combustion of caffeine.
Formula used :
where,
Q = heat of combustion of caffeine = ?
c = specific heat of calorimeter =
= change in temperature =
Now put all the given value in the above formula, we get:
Now we have to calculate the moles of caffeine.
Mass of caffeine = 0.275 g
Molar mass of caffeine = 194.19 g/mole
Now we have to calculate the heat of combustion per mole of caffeine at constant volume.
Therefore, the heat of combustion per mole of caffeine at constant volume is 76197.18 kJ/mole