Question

How much heat is needed to raise the temperature of 9g of water by 19oC?

Answer 1

Answer:

This will need  715.806 J of heat energy to raise the temperature.

Explanation:

To calculate how much heat is needed to raise the temperature of any substance, you need:

The mass of the substance,  m, which for you is 9g

The temperature change that occurs,  ΔT, which for you is 19ºC.

The specific heat capacity of the substance,  c  (which you can look up here: http://www2.ucdsb.on.ca/tiss/stretton/Database/Specific_Heat_Capacity_Table.html

), (It is the amount of heat required to raise 1 gram of that substance by 1°C.)

For water, the value of  c  is  4.186J/g°C

Then, this is the equation you need:

$Q=mc$ΔT

Where Q is the heat needed

So,  

$Q=(9g)(4.186J/gC)(19C)=715.806 J$

You need 715.806J to raise the temperature of water by 19ºC