The aromatic hydrocarbon cymene (C10H14) is found in nearly 100 spices and fragrances including coriander, anise, and thyme. The
1 answer:
Answer:
5878 kJ/mol
Explanation:
According to the law of conservation of energy, the sum of the heat released by the combustion and the heat absorbed by the calorimeter is zero.
Qcomb + Qcal = 0
Qcomb = -Qcal [1]
The heat absorbed by the calorimeter (Qcal) can be calculated using the following expression:
Qcal = Ccal . ΔT = 3.640 kJ/°C × 19.35°C = 70.43 kJ
where,
Ccal is the heat capacity of the calorimeter
ΔT is the difference in temperature
From [1],
Qcomb = - 70.43 kJ
Since this heat is measured at constant pressure, the molar enthalpy of combustion of cymene is:
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Answer:
Explanation:
The breakdown reaction of ozone is as follows
It can be seen that 2 moles of ozone is required in the complete cycle
So for 10 cycles, 20 moles of ozone is required
m = Mass of = 15.5 g
M = Molar mass of = 104.46 g/mol
P = Pressure = 24.5 mmHg
T = Temperature = 232 K
R = Gas constant =
Number of moles is given by
From ideal gas law we have
For 20 cycles of the reaction the volume of the ozone is .