Calculate the amount of heat liberated (in kJ) from 374 g of mercury when it cools from 83.7°C to 19.1°C.

heat=mass*specific heat*deltaTemp

look up the specific heat of Hg.

To calculate the amount of heat liberated, we can make use of the formula:

q = m * c * ΔT

where:
q is the heat liberated (in joules),
m is the mass of the substance (in grams),
c is the specific heat capacity of the substance (in joules per gram degree Celsius),
ΔT is the change in temperature (in degrees Celsius).

First, we need to find the specific heat capacity of mercury. The specific heat capacity of mercury is approximately 0.14 J/g°C.

Now, we can substitute the given values into the formula and calculate the heat liberated:

m = 374 g (mass of mercury)
c = 0.14 J/g°C (specific heat capacity of mercury)
ΔT = 83.7°C - 19.1°C (change in temperature)

Substituting these values into the formula, we have:

q = 374 g * 0.14 J/g°C * (83.7°C - 19.1°C)

Calculating this expression will give us the heat liberated in joules.

To convert joules to kilojoules, divide the value by 1000:

q (in kJ) = q (in J) / 1000

By following these steps, you can find the amount of heat liberated in kilojoules from 374 g of mercury when it cools from 83.7°C to 19.1°C.