Hydrocarbons, compounds containing only carbon and hydrogen, are important in fuels. The heat of combustion of cyclopentane, C5H10, is 786.6 kcal/mol. Write a balanced equation for the complete combustion of cyclopentane. + + How much energy is released during the complete combustion of 336 grams of cyclopentane ? kcal

If reacting 3.08 g of chlorine monoxide (ClO), a highly reactive radical, with an excess of ozone (O3) produces 1.65 kcal of heat, then what is the enthalpy change for the following reaction (in kcal/mol)?  ClO (g) + O3 (g) → Cl (g) + 2 O2 (g)

chemistry [References] TUTOR Coffee Cup Calorimetry: Specific Heat I In the laboratory a "coffee cup" calorimeter, or constant pressure calorimeter, is frequently used to determine the specific heat of a solid, or to measure the energy of a solution phase reaction. Thermometer Stirring rod A student heats 66.74 grams of nickel to 98.38 °C and then drops it into a cup containing 78.65 grams of water at 20.69 °C. She measures the final temperature to be 26.85 °C. The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.80 J/°C. Water Assuming that no heat is lost to the surroundings calculate the specific heat of nickel. Metal sample Specific Heat (Ni) = J/g °C. Show Approach Show Tutor Steps Submit Submit Answer Try Another Version 10 item attempts remaining Previous Ne

4. Given the balanced equation representing a reaction: 2 Na(s) + Cl2 (g) → 2 NaCl(s) + energy If 46 grams of Na and 71 grams of Cl2 react completely, what is the total mass of NaCl produced?

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The combustion of propane (C3H8) produces 2220 kJ of energy per mole of propane consumed. What mass in grams of propane will be required to heat 55.0 gal of bathtub water from 25.0°C to 35.0°C if the process is 80.0% efficient? (1 gal = 3.785 L, 1 cal = 4.184 J, the density of water is 1.00 g/mL, the specific heat of water is 1.00 cal/(g°C)

A 0.40-g sample of vegetable oil is placed in a calorimeter. When the sample is burned, 17.3kJ is given off What is the energy value (kcal/g) for the oil? Express your answer to two significant figures ? kcal/g

A 6.55 g sample of an unknown salt (MM = 116.82 g/mol) is dissolved in 150.00 g water in a coffee cup calorimeter. Before placing the sample in the water, the temperature of the salt and water is 23.72°C. After the salt has completely dissolved, the temperature of the solution is 28.54°C. What is the total mass inside the calorimeter in grams?

5. A 1.500-g sample of a hydrocarbon is placed in a bomb calorimeter and undergoes combustion. The temperature of the calorimeter rises from 20.00°C to 23.55°C. If the calorimeter has a heat capacity of 40.3 J/°C, what is the heat of combustion (qv) for this hydrocarbon in kJ/g? 6. The heat of sublimation for iodine is 62.4 kJ/mol, at 25°C and 1.00 atm. What is AE for the sublimation of iodine (shown below) under these conditions? 2 (s) F 2 (g) volsd 7. A bomb calorimeter with heat capacity of 1.500x103 J/°C was used to study combustion of terbium (Tb) in excess oxygen: 4 Tb (s) + 3 O2 (g) →2 Tb2O3 (s) When 1.000-g of terbium was burned, a temperature increase of 3.908°C was observed. What is the AE for the reaction, in kJ/mol of Tb2O3?

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