Question

How much energy must be added to a bowl of 125 popcorn kernels in order for them to reach a popping temperature of 175°C? Assume that their initial temperature is 21°C, that the specific heat of popcorn is 1650 J/kg°C and that each kernel has a mass of 0.0001 kg

a) 124 J
b) 1200 J
c) 3176 J
d) 44210 J

Answer 1

c) 3176 J

Step-by-step explanation:

mass of 125 popcorn = 125 x .0001 = . 0125 kg

increase in temperature = 175 - 21 = 154°C

specific heat of popcorn = 1650

heat required to increase temperature

= mass of popcorn x increase in temperature x specific heat

= .0125 x 154 x 1650

= 3176.25 J