A Big Mac hamburger from McDonald’s contains 540 Calories. (a) How many kilojoules does a Big Mac contain? (b) For how many hours could the amount of energy in a Big Mac light a 100 watt light- bulb? (1 watt = 1 J/s)

1 Answer
Gió
Jun 20, 2015

#2259.36 kJ#
#6# hours and a half (almost)

Explanation:

Considering that #1 Cal=4.186 kJ=4184 J#
then #540 Cal =540xx4184=2259360 J=2259.36 kJ#.
Your light bulb needs #100J# each second so if you have #2259360 J# it can operate for #2259360/100=22593.6 s=6.276 hr#

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