Question

Calculate: A. Mercury has a specific Heat Capacity of 0.14 J/goC. How much heat is needed to raise the thermometer temperature 15 oC to 95 oC. There is 5 g of mercury in the thermometer.

Answer 1

`\boxed {\boxed {\sf 56 \ Joules}}`

Step-by-step explanation:

We are given the mass, specific heat, and temperature, so we must use this formula for heat energy.

`q=mc \Delta T`

The mass is 5 grams, the specific heat capacity is 0.14 Joules per gram degree Celsius. Let's find the change in temperature.

• ΔT= final temperature - initial temperature
• ΔT= 95°C - 15°C = 80°C

We know the variables and can substitute them into the formula.

`m= 5 \ g \\c= 0.14 \ J/ g \ \textdegree C \\\Delta T= 80 \ \textdegree C`

`q= (5 \ g )( 0.14 \ J/ g \ \textdegree C ) ( 80 \ \textdegree C)`

Multiply the first numbers. The grams will cancel.

`q= 0.7 \ J/ \textdegree C(80 \ \textdegree C )`

Multiply again. This time the degrees Celsius cancel.

`q= 56 \ J`

56 Joules of heat are needed.