How much heat is required to warm 1.30 kg of sand from 30°C to 100°C?
Heating 1.30 Kg of sand 70 degrees Celsius takes 80,000 Joules of heat.
The amount of heat required to warm a substance is determined using heat capacity. The equation below allows us to solve for the heat released or absorbed when warming a substance.
For the equation above:
Specific heat capacity (
In your specific problem:
(you must convert to grams when using specific heat capacities since they are in the units of grams)
Next we plug our values into the top equation listed:
Since your temperature has only one significant figure we round to one sig fig:
q = 80,000 J.
For more examples see this video: