Answer:
See attached
Step-by-step explanation:
You want the calculated results from an experiment in which bread is combusted to heat water.
Computations
The temperature increase is the difference between the final temperature and the initial temperature:
∆T = T1 -T0
The energy released is the product of the increase in temperature, the mass of water (assumed to be 20 g), and the specific heat of water (about 4.184 J/g). You seem to be using a multiplier of (20 g)(4.184 J/(gK)) ≈ 84 J/K.
∆E = (84 J/K)∆T
The energy released per gram of bread is the released energy divided by the number of grams of bread.
J/g = (∆E)/(grams of bread)
These formulas are written into the attached spreadsheet. The results are shown.
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Additional comment
The units of temperature difference for temperatures on the Celsius or Kelvin scale are "Kelvins" (K). Often, you will see 36 °C -21 °C = 15 °C. Technically, the difference is 15 K.