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Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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
Transcribed Image Text:Calculate the amount of heat released in the combustion of 5.6 grams of Al with 8.6 grams of O2 to
form Al203(s) at 25°C and 1 atm. AHf Al203(s) = -1676 kJ/mol Enter a positive number since
released already implies a negative number. Enter to 0 decimals.
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- Calculate the energy required to heat 157.0 g of graphite from 4.3 °C to 13.8 °C. Assume the specific heat capacity of - 1 - 1 graphite under these conditions is 0.710 J•g K. Round your answer to 2 significant digits. alo Ar Dloarrow_forwardGiven the following thermochemical equations P4(s) + 6C12(g) 4PCI3(g) AH = -2439 kJ/mol 4PCI5(g) → P4(s) + 10CI 2(g) AH = 3438 kJ/mol find the AH for the reaction below, PCI5(g) → PC|3(g) + Cl2(g) O A) +249.8 kJ/mol O B) +999 kJ/mol O C) -999 kJ/mol O D) -249.8 kJ/molarrow_forwardNatural gas burns in air to form carbon dioxide and water, releasing heat. CH4(g) + O2(g) → CO2(g) + H2O(g) ΔHorxn = -802.3 kJ What minimum mass of CH4 is required to heat 23g of water by 32oC? (Assume 100% heating efficiency.) Natural gas burns in air to form carbon dioxide and water, releasing heat. CH4(g) + O2(g) → CO2(g) + H2O(g) ΔHorxn = -802.3 kJ What minimum mass of CH4 is required to heat 23g of water by 32oC? (Assume 100% heating efficiency.) 62 g 22.5 g 7.80 mg 61 mg 118 mgarrow_forward
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- A chemist carefully measures the amount of heat needed to raise the temperature of a 1.65kg sample of C9H10O2 from 25.9°C to 37.9°C. The experiment shows that 3.09 X 104J of heat are needed. What can the chemist report for the molar heat capacity of C9H10O2? Round your answer to 3 significant digits. = J * mol-1 * K-1arrow_forwardHow many grams of ethanol (C2H5OH) is needed to provide/release 699.0 kJ of heat? C2H5OH(l) + 3O2(g) ----> 2CO2(g) + 3H2O(g); ΔH = -2044 kJ The answer must be grams and a positive number.arrow_forwardHot water heaters often use natural gas (methane) to generate heat. Methane and oxygen react to form carbon monoxide according to the overall equation: 2CH4(g)+3O2(g) = 2CO(g)+4H2O(g) The enthalpy of formation for each compound are as follows: CH4: - 74.6 O2: 0 CO: - 110.5 H2O: - 285.8 Part A: calculate the overall enthalpy change of the reaction. Part B: A typical water heater contains 40.0 gallons of water. After a long vacation, you come home and turn your water heater from "vacation mode" to hot. How many moles of methane must be combusted to heat the water in your water heater from 30.0°C to 48.0°C? The density of water is 3.79 kg/gal, the specific heat capacity of water is 4.182 J/g°C, and the water heater has a heat capacity of 850.0 J/g°C.arrow_forward
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