Question

A burning match releases 838.2 J of energy. Convert the energy released by 20 matches to the following energy units: (provide an answer in 4 significant figures)

________ Kilojoules
________ Calories
________ Food Calories
________ calories
________ kcal

Answer 1

See explanation

Step-by-step explanation:

In this case, we can start with the calculation of the total energy released by the 20 matches. One match release 838.2 J of energy ( 1 match = 838.2 J). So:

`20~matches(838.2~J)/(1~match)=16764~J`

With this in mind, we have to find al the conversion ratios to "Jolues", so:

`1~KJ=1000~J`

`1~Cal=4.184~J`

`1~KCal=4184~J`

`0.000239~food~calories=1~J`

Now, we can do the conversions:

`16764~J(1~KJ)/(1000~J)=16.76~KJ`

`16764~J(1~Cal)/(4.184~J)=4.005x10^3~Cal`

`16764~J(1~KCal)/(4184~J)=4.007~KCal`

`16764~J(0.000239~food calories)/(1~J)=4.006~food calories`

I hope it helps!