Answer:
Approximately 2000 J.
General Formulas and Concepts:
Thermodynamics
Specific Heat Formula: q = mcΔT
- q is heat (in J)
- m is mass (in g)
- c is specific heat (in J/g °C)
- ΔT is change in temperature (in °C or K)
Explanation:
Step 1: Define
Identify variables
[Given] c = 0.897 J/g °C
[Given] m = 79 g
[Given] ΔT = 28°C
[Solve] q
Step 2: Solve for q
- Substitute in variables [Specific Heat Formula]: q = (79 g)(0.897 J/g °C)(28 °C)
- Multiply [Cancel out units]: q = (70.863 J/°C)(28 °C)
- Multiply [Cancel out units]: q = 1984.16 J
Step 3: Check
Follow sig fig rules and round. We are given 2 sig figs as our lowest.
1984.16 J ≈ 2000 J
