Chem
posted by Connie on .
What is the amount of energy of calories to heat 8.5g of water from 15 C to 36 C?
I think you take 8.5g x 21 degree C, but then I am stuck. Thank you

amount of energy absorbed or released is given by
Q = mc*(T2  T1)
where
Q = heat (in Joules)
m = mass (in grams)
c = specific heat capacity (J/gK)
T = temperature (in Celsius or Kelvin)
*note that Q is (+) if the object absorbed heat, and () if it released heat.
for water, c = 4.184 J/gK (you can find this in books or you can google this)
substituting,
Q = 8.5*4.184*(3615)
Q = ?
now solve for Q. units in Joules.
hope this helps~ :)