So I just started learning about enthalpy changes and all the equations that go along with it (for grade 12 chem). I wasn't sure how to do a few questions, so I'd really appreciate the help. I'm mostly kinda confused on when to use the equations q = mcΔH and ΔH=nΔHx
Here are the questions I had trouble with:
1) How much will the temperature of a 180.0g cup of coffee at 95.0°C be reduced when a 45.0g silver spoon at 25.0°C is placed in the coffee? The specific heat capacity of silver is 0.24J/(g°C)?
And I also had this question, if you have time to help with it as well:
2) The body generates energy from food and fats by the same overall process as combustion. Determine the energy per gram of glucose, C6H12O6.
C6H12O6(s) + 6O2(g) --> 6CO2(g) + 6H2O(l) ΔH = -2803kJ