Untitled.notebook 1 November 11, 2012 1. A 1.55 g of CH4O sample is burnt in a calorimeter. If the molar heat of combuson of CH4O is ‐725 kJ/mole, and assuming that the 2.00 L of water absorbed all of the heat of combuson, what temperature change did the water experience (c water = 4.184J/gC)? (3)
10
Embed
capacity of the bomb calorimeter. (3) - Coursesmrrumbolt.weebly.com/uploads/4/9/5/2/4952485/u1a2solutions.pdf · capacity of the bomb calorimeter. (3) ... Notes,Whiteboard,Whiteboard
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Untitled.notebook
1
November 11, 2012
1. A 1.55 g of CH4O sample is burnt in a calorimeter. If the molar heat of combuson of CH4O is ‐725 kJ/mole, and assuming that the 2.00 L of water absorbed all of the heat of combuson, what temperature change did the water experience (c water = 4.184J/gC)? (3)
Untitled.notebook
2
November 11, 2012
1. In order to obtain calibraon data for a bomb calorimeter, three 2.50 g samples of methanol were burned. The average temperature change of 4.23°C was recorded. The molar heat of combuson of methanol is ‐726 kJ/mol. Calculate the heat capacity of the bomb calorimeter. (3)
Untitled.notebook
3
November 11, 2012
1. A student dropped 5.00 g of an unknown acid HX, into 75.0 ml of aqueous Lithium Hydroxide, LiOH(s),. The reacon mixture absorbed 525 J as it warmed. Assuming it had a specific heat capacity of
4.184 :a. what was the temperature change of the reacon mixture?
(Hint: what is the mass of the new soluon?) (3)b. What was the molar enthalpy of reacon for the acid,
assuming a molar mass of 36.46 g/mol. (3)
Untitled.notebook
4
November 11, 2012
1. Find the ΔH for the reaction below, given the following reactions and subsequent ΔH values: (4)
1. A 275 g aluminum can is filled with 100.0 mL of water and suspended over a peanut. Calculate the fuel value of peanuts if burning a peanut with a mass of 0.358 g caused the temperature of the water to rise +5.46°C. (Hint: the aluminum can
AND the water absorb heat) (4)
Untitled.notebook
6
November 11, 2012
1. A. Use enthalpies of formaon to calculate the molar enthalpy for the reacon below. (4)