Ch7 Example Problems

Ch7 Example Problems - c) 6.00 kJ/mol d) +12.00 kJ/mol 4)...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
HODSON CHE 1301 Petrucci Ch7 Example Problems The following problems are taken from old exams . ..... 1) 100.0 g of nickel at 150.0 °C was placed in 1.00 L of water at 25.0 °C. The final temperature of the nickel-water mixture was 26.3 °C. What is the specific heat of the nickel? a) 0.554 b) 0.130 c) 2.28 d) 0.439 e) 0.144 2) Cyclohexanol, C 6 H 12 O, has a heat of combustion (q rxn ) of –890.7 kcal/mol. 0.708 g of cyclohexanol undergoes complete combustion in a bomb calorimeter that has a heat capacity of 2.70 kcal/°C. What is the final temperature if the initial water temperature is 27.0 °C? a) 29.3°C b) 27.4 °C c) 24.7 °C d) 26.6 °C e) 31.4 °C 3) Two solutions, 250.0 mL of 1.00 M CaCl 2(aq) and 250.0 mL of 1.00 M K 2 CO 3(aq) , were added to a calorimeter with a heat capacity of 1.25 kJ/°C and the temperature decreased by 2.40 °C. Determine q rxn per mole of CaCO 3(s) formed in the reaction. a) –12.0 kJ/mol b) +6.00 kJ/mol
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: c) 6.00 kJ/mol d) +12.00 kJ/mol 4) Calculate U for a system that loses 475 kJ of heat and does 155 kJ of expansion work on the surroundings a) +320 kJ b) 630 kJ/mol c) 320 kJ d) +630 kJ 5) Combine the reactions: P 4(s) + 6 Cl 2(g) 4 PCl 3(g) H = 1225.0 kJ PCl 3(g) + 3 H 2 O (l) H 3 PO 3(aq) + 3 HCl (g) = 853.5 kJ 2 H 2(g) + O 2(g) 2 H 2 O (l) = 571.5 kJ H 2(g) + Cl 2(g) 2 HCl (g) = 184.9 kJ to obtain the reaction: P 4(s) + 6 H 2(g) + 6 O 2(g) 4 H 3 PO 3(aq) What is the value of H for this reaction? a) 9177.4 kJ b) 8605.9 kJ c) 2465.1 kJ d) 6958.6 kJ e) 2834.9 kJ 6) Consider the reaction: 4 NH 3(g) + 5 O 2(g) 4 NO 2(g) + 6 H 2 O (l) H f 46.19 0.00 90.37 285.85 kJ/mol Compute H for this reaction. a) 622.62 kJ b) -241.67 kJ c) -1168.9 kJ d) -149.29 kJ e) 984.10 kJ...
View Full Document

Page1 / 2

Ch7 Example Problems - c) 6.00 kJ/mol d) +12.00 kJ/mol 4)...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online