Answer :
To find the energy required to raise the temperature of a 5 kg piece of lead from 40°C to 58°C, we can use the formula:
Energy = mass x specific heat capacity x temperature change
we need to calculate the temperature change. The initial temperature is 40°C, and the final temperature is 58°C. So the temperature change is:
Temperature change = Final temperature - Initial temperature
Temperature change = 58°C - 40°C
Temperature change = 18°C
we can plug in the values into the formula:
Energy = mass x specific heat capacity x temperature change
Energy = 5 kg x 128 J/kgK x 18°C
units for temperature change must match the units for specific heat capacity (K or Kelvin). To convert Celsius to Kelvin, we simply add 273 to the Celsius temperature:
Energy = 5 kg x 128 J/kgK x 18 K
Multiplying the numbers together, we get:
Energy = 115,200 J
To express the answer in kilojoules, we divide by 1000:
Energy = 115.2 kJ
the energy required to raise the temperature of a 5 kg piece of lead from 40°C to 58°C is approximately 115.2 kilojoules.
To know more about specific heat capacity:
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