Calculate the following quantities, and record them in the table:
• the number of moles of citric acid used (use 192.13 grams/mole as the molar mass of
citric acid.)
• the heat absorbed by the water, in joules (use q = mcat, where 15.0 milliliters of water
has a mass of 15.0 grams. use 4.186 joules/gram degree celsius as water's specific heat
capacity.)
• the change in internal energy of the mixture of citric acid and sodium bicarbonate.
(assume that energy absorbed by the mixture of citric acid and sodium bicarbonate is
released by the water.)
• the reaction enthalpy, in joules/mole

moles of citric acid
heat absorbed by
water
change in internal
energy (1)
reaction enthalpy
(l/mol)
inital temp = 20.8
final temp = 29.2
change in temp 8.4