how many joules of energy are needed to change 400 grams of water from 35 degrees C to 45 degrees C?
J = mass H2O x specific heat H2O x (Tfinal-Tinitial) = ?
To calculate the amount of energy required to change the temperature of a substance, you can use the formula:
Q = m * c * ΔT
where:
Q is the energy in joules,
m is the mass of the substance in grams,
c is the specific heat capacity of the substance in J/g·°C, and
ΔT is the change in temperature in °C.
In this case, we have:
m = 400 grams
c = the specific heat capacity of water, which is 4.18 J/g·°C
ΔT = 45°C - 35°C = 10°C
Now we can substitute these values into the formula and calculate the energy required:
Q = 400 g * 4.18 J/g·°C * 10°C
Q = 16,720 J
Therefore, 16,720 joules of energy are needed to change 400 grams of water from 35°C to 45°C.