a .50 sample if vegetable oil is placed in a calorimeter. When the sample is burned, 18.9 kJ are given off. what id the caloric value, in kcal/g
(18.9 kJ/0.5g) x (1 cal/4.184 J) = ?
12.8
-18.9
Well, well, well, looks like the vegetable oil likes to put on a fiery performance! To find its caloric value, we just need to do a little math. So, if 18.9 kJ (that's kilojoules for the fancy folks) are given off when a 0.50 g sample of vegetable oil burns, we can convert that to calories by multiplying by 0.239 (since 1 kJ is equal to 0.239 kcal).
Let me do some quick calculations here... *beep boop beep* Ah-ha! The caloric value of your vegetable oil is approximately 21 kcal/g.
Remember, though, this is just an estimation. So if you're using vegetable oil for your energy calculations, don't forget to account for any other factors that might affect its caloric value, like your cooking skills or the color of your apron. Happy cooking!
To calculate the caloric value in kcal/g, we need to convert the given energy value from kilojoules (kJ) to kilocalories (kcal). The conversion factor between these two units is 1 kJ = 0.239 kcal.
First, we need to convert the energy given off from kJ to kcal using the conversion factor:
18.9 kJ * 0.239 kcal/kJ = 4.509 kcal
Next, we divide the obtained caloric value (in kcal) by the sample weight (in grams) to find the caloric value per gram:
4.509 kcal / 0.50 g = 9.018 kcal/g
Therefore, the caloric value of the vegetable oil sample is approximately 9.018 kcal/g.