Question

A 5 oz carrot is burned in a calorimeter containing 10.0 lb of water. The water heats up from 20.5 oC to 22.8 oC. How many Calories are in the 5 oz carrot? Round to correct sig. fig.
1 Cal = 1000 cal.

Answer 1

Convert 5 oz to grams. There are 28.4 g in an oz. Convert 10.0 lb H2O to grams. There are 453.6 g in a lb.
q = mass H2O x specific heat H2O x (Tfinal-Tinitial)
You know Tf and Ti as well as mass H2O and specific heat H2O = 1 cal/g.
When q is calculated the unit will be calories. Convert that to Calories (actually that's kcal) by calories/1000 = kcal = Cal.

Answer 2

I forgot to add the weight of the 10.0 lbs of H2O. I got it, Thanks