A 0.45-g sample of vegetable oil is placed in a calorimeter. When the sample is burned, 18.9 kJ is given off.
What is the energy value (kcal/g) for the oil?
Convert 18.9 kJ to kcal. That's for a 0.45 g sample. Change that to kcal/g. Post your work if you get stuck.
4.493306
To find the energy value of the oil in kcal/g, we need to convert the given energy value in kJ to kcal and divide it by the mass of the oil.
1 kcal = 4.184 kJ
First, convert the energy value from kJ to kcal:
18.9 kJ x (1 kcal / 4.184 kJ) = 4.52 kcal
Next, divide the converted energy value by the mass of the oil:
4.52 kcal / 0.45 g = 10.04 kcal/g
Therefore, the energy value of the oil is approximately 10.04 kcal/g.
To find the energy value (in kcal/g) for the oil, we need to calculate how much energy is released per gram of the oil.
We are given that a 0.45-g sample of vegetable oil releases 18.9 kJ of energy when burned.
To convert kJ to kcal, we can use the conversion factor: 1 kcal = 4.184 kJ
So, the energy released from the 0.45-g sample of vegetable oil can be calculated as follows:
18.9 kJ × (1 kcal/4.184 kJ) = 4.52 kcal
Now, we can find the energy value in kcal/g by dividing the energy released (4.52 kcal) by the mass of the sample (0.45 g):
Energy value (kcal/g) = 4.52 kcal / 0.45 g = 10.04 kcal/g
Therefore, the energy value for the vegetable oil is approximately 10.04 kcal/g.