When 3.6 g of butanal (mass of one mole = 72 g) was burned, 124 kJ of energy was released - Scottish Highers Chemistry - Question 16 - 2018
Question 16
When 3.6 g of butanal (mass of one mole = 72 g) was burned, 124 kJ of energy was released.
What is the enthalpy of combustion of butanal, in kJ mol⁻¹?
A -6 kJ
B +6... show full transcript
Worked Solution & Example Answer:When 3.6 g of butanal (mass of one mole = 72 g) was burned, 124 kJ of energy was released - Scottish Highers Chemistry - Question 16 - 2018
Step 1
Calculate the number of moles of butanal burned
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Answer
To find the number of moles, use the formula:
t = \frac{mass}{molar \ mass}
In this case:
t = \frac{3.6 \ g}{72 \ g/mol} = 0.05 \ mol
Step 2
Determine the enthalpy of combustion per mole
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Answer
The energy released for burning 0.05 moles is 124 kJ. To find the enthalpy change per mole:
