Energetics Questions and Answers

The rate constant for the reaction is 0.260 M-¹. s-¹ at 200
Physical Chemistry
Energetics Solutions
The rate constant for the reaction is 0.260 M-¹. s-¹ at 200 °C. A → products If the initial concentration of A is 0.00140 M, what will be the concentration after 605 s?
We have a bomb calorimeter with a heat capacity of 555 J/K.
Physical Chemistry
Energetics Solutions
We have a bomb calorimeter with a heat capacity of 555 J/K. In this bomb calorimeter, we place 1000.0 mL of water. We burn 2.396 g of a solid in this bomb calorimeter. The temperature of the bomb
Dietheyl ether has a vapor pressure of 0.991 torr at -73.9℃.
Physical Chemistry
Energetics Solutions
Dietheyl ether has a vapor pressure of 0.991 torr at -73.9℃. The heat of vaporization is Δvap = 34.0 kJ/mol What is the vapor pressure at 9.4 C in torr? Do not write unit in answer. Report your answer
Describe the phase and temperature changes that will occur
Physical Chemistry
Energetics Solutions
Describe the phase and temperature changes that will occur if you heat 50.0 g of Compound X in its solid state at -8°C until it all vaporizes. You may draw a diagram or graph if it helps answer the
In the reaction of aluminum and iron(III) oxide to form iron
Physical Chemistry
Energetics Solutions
In the reaction of aluminum and iron(III) oxide to form iron and aluminum oxide, ΔH is -850 kJ. How many kJ are released when 10. g of Al react? 2 Al(s) + Fe₂O3 (s) → 2 Fe (s) + Al₂O3 (s) ΔH= -850 kJ
The heat of fusion for sodium (Na) is 2.6 kJ/mol. How much
Physical Chemistry
Energetics Solutions
The heat of fusion for sodium (Na) is 2.6 kJ/mol. How much heat is needed to melt 46 grams of Na at its melting point of 98 °C? 1.3 kJ 5.2 kJ 49.0 kJ 19 kJ
The following information is given for manganese at 1 atm:
Physical Chemistry
Energetics Solutions
The following information is given for manganese at 1 atm: Tb = 2095.00°C Tm = 1244.00°C Specific heat solid = 0.4770 J/g °C Specific heat liquid = 0.8370 J/g °C ΔHvap (2095.00°C) = 4.090 × 10³ J/g ΔH
Photosynthesis, the reaction plants use to make glucose, is
Physical Chemistry
Energetics Solutions
Photosynthesis, the reaction plants use to make glucose, is an endothermic reaction. The reaction is shown below. Which statement best describes the energy of the products and reactants in the
If 8.00 g ammonium nitrate is dissolved in 1.0 L water, the
Physical Chemistry
Energetics Solutions
If 8.00 g ammonium nitrate is dissolved in 1.0 L water, the water decreases in temperature from 21.0 °C to 20.39 °C. Determine the molar heat of solution of the ammonium nitrate. (ans.: +26 kJ/mol
In a calorimetry experiment, 0.1277 g of Mg ribbon was added
Physical Chemistry
Energetics Solutions
In a calorimetry experiment, 0.1277 g of Mg ribbon was added to 200.0 mL 0.500 M HCl at 24.12 °C. The water temperature increased to 27.10 °C. Calculate AH per mole of HCI. (ans: -24.9 kJ/mol HCI)
Which of the following equations brings a decrease in
Physical Chemistry
Energetics Solutions
Which of the following equations brings a decrease in entropy? In 2 CO3 (aq) + 2HCI (aq)→2NaCl (aq) + H2O(l) + C2 (g) NH4Cl (s)+ CaO(s) →12 NH3(g) + CaCl₂(s) + H₂O(l) CO2(g) + CaO(s) → CaCO3(s) 4NH 3
Given: H₂(g) + Br₂(g) = 2HBr(g) and ΔH° = 39.3 kJ/mol ΔS° =
Physical Chemistry
Energetics Solutions
Given: H₂(g) + Br₂(g) = 2HBr(g) and ΔH° = 39.3 kJ/mol ΔS° = 92.4 J/mol-K. A closed container in which has initial partial pressures of PH₂ = PBr₂ = 0.200 atm and PHBr = 0.600 atm is heated to 350. °C