1. (8 pts) Virtually every pchem textbook has a table of enthalpy values for 25°C. One...
1. (8 pts) Virtually every pchem textbook has a table of enthalpy values for 25°C. One use for these may be to calculate the enthalpy for a phase change such as compounds boil at 25°C. You are going to calculate the percent difference between the heat of vaporization of ethanol using data for 25°C and that at its boiling point of 78°C. boiling. However, not too many a) Write the chemical equation that shows the vaporization of 1 mol of...
Ethanol (C2H5OH) melts at -114 ∘C and boils at 78 ∘C. The enthalpy of fusion of ethanol is 5.02 kJ/mol, and its enthalpy of vaporization is 38.56 kJ/mol. The specific heat of solid and liquid ethanol are 0.97 J/g⋅K are 2.3 J/g⋅K respectively. A) How much heat is required to convert 30.5 g of ethanol at 30 ∘C to the vapor phase at 78 ∘C? Q=______kJ B)How much heat is required to convert 30.5 g of ethanol at -167 ∘C...
UJUH POHL Given the following information: Using the data given below at 25°C, calculate the change in enthalpy (DH) for the following reaction: 2PC13(g) + O2(g) ® 2POC13(g) Calculate the AH°rxn for the combustion of ethanol using the given AH°F. AHºf, ethanol (1) = -277.6 kJ/mol AHºf, water (1) = -285.8 kJ/mol AHºf, carbon dioxide (g) = -393.5 kJ/mol
36.1 J/K mol. Calculate the boiling point of liquid Liquid nitrogen has a measured enthalpy of vaporization (AH vap -2.79 kJ/mol and entropy of vaporization (AS nitrogen, in °C using this information. (Use 273.15 K 0°C for the temperature conversion. Report your answer with three significant figures.) Tp C
Ethanol,CH3CH2OH , has a vapor pressure of 59 mm Hg at 25 °C. What quantity of energy as heat is required to evaporate 115 mL of the alcohol at 25 °C? The enthalpy of vaporization of the alcohol at 25 °C is 42.32 kJ/mol. The density of the liquid is 0.7849 g/mL.
Homework #1 Based on the type or types of intermolecular force, predict the substance in each pair that has the highest boiling point: a) Diethyl ether (CHsCH2OCH2CHs) or 1-butanol (CH3CH2CH2CH2OH) b) SO2 or SO 1. Ethanol (C2H5OH) melts at-114°C and boils at 78 ℃. The enthalpy of fusion of ethanol is 502 kJ/mol, and its enthalpy of vaporization is 38.56 kJ/mol. The specific heat capacity of solid and liquid ethanol are 0.97 and 2.3 J/8-K, respectively. a) How much heat...
The heat of vaporization of benzene (C6H6) is 30.77 kJ/mol at it's boiling point (80 C). As a liquid, it has a heat capacity of 134.8 J/mol*K, and as a gas it has a heat capacity of 82.4 J/mol*K. Calculate the enthalpy change of heating 245g of benzene from 50 C to 100 C.
potassium metal has melting point of 63.65 C and a boiling point of 774 C Enthalpy fusion = 14.37 cal/g enthaply of vaporization = 490.3 cal/g Specific heat @ solid = .1759 cal/gC specfic heat @ liquid =.5425 cal /gC specfic heat @ gas = .2629 cal /gC a) draw heatung curve that us heated from 23C to 1200c b) Calculate total heat required in units of kJ for 39.5 g of potassium
Given the following information for ethanol, C,H,OH (at 1 atm), calculate the amount of heat in kneeded (at 1 atm) to vaporize a 20.6-g sample of liquid ethanol at its normal boiling point of 78.4 °C. boiling point = 78.4 °C AHvap 78.4 °C) = 38.6 kJ/mol melting point = -115°C AH(-115 °C) -5.02 kJ/mol specific heat liquid = 2.46 J/gºC
Part II-Short Answer 13) Answer the following guestions about entropy and enthalpy (6 pts) A) The boiling temperature of liquid ethanol is 78.45 "C and the AHyan is 38.56 kJ/mol. Calculate the ASyap for ethanol. AS13481,u22 l 3H-TS AHvap tb T AS= TOH Vap 1091md? 03 351.45K(38-50k3mol) B) ASvap for oxygen is 37.8 J/mol K at its boiling temperature of -182.9 C Calculate the change in entropy of the oxvgen when 7,40 moles of gas is condensed into liquid oxygen...