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It is a hot summer day, and Chris wants a glass of lemonade. There is none in the refrigerator, so a new batch is prepared from freshly squeezed lemons. When finished, there are
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Introductory Chemistry: An Active Learning Approach
- What mass (g) of ethanol, CH3CH2OH(), can be vaporized at its boiling point of 78.4 C by transfer of 500. kJ to the liquid? The vapH of ethanol is 38.6 kJ/mol at this temperature.arrow_forwardA 1.40-g sample of polyethylene, a common plastic, is dissolved in enough organic solvent to give 100.0 mL of solution. What is the average molar mass of the polymer if the measured osmotic pressure of the solution is 1.86 mm Hg at 25 C?arrow_forwardWhy does sweating cool the human body?arrow_forward
- The cooling effect of alcohol on the skin is due to its evaporation. Calculate the heat of vaporization of ethanol (ethyl alcohol), C2H5OH. C2H5OH(l)C2H5OH(g);H=? The standard enthalpy of formation of C2H5OH(l) is 277.7 kJ/mol and that of C2H5OH(g) is 235.1 kJ/mol.arrow_forwardIf you want to convert 56.0 g ice (at 0 °C) to water at 75.0 °C, calculate how many grams of propane, C3H8, you would have to bum to supply the energy to melt the ice and then warm it to the final temperature (at 1 bar).arrow_forwardWill a closed container of water at 70 C or an open container of water at the same temperature cool faster on a cold winter day? Explain why.arrow_forward
- 5-106 The normal boiling point of hexane, C6H14, is 69°C, and that of pentane, C5H12, is 36°C. Predict which of these compounds has a higher vapor pressure at 20°C.arrow_forwardHow much energy is given off when 563.8 g of NaCl solidifies at its freezing point of 801C ?arrow_forwardA generic solid, X, has a molar mass of 76.0 g/mol. In a constant‑pressure calorimeter, 37.7 g of X is dissolved in 399 g of water at 23.00 °C. X(s)⟶X(aq) The temperature of the resulting solution rises to 25.20 ∘C. Assume the solution has the same specific heat as water, 4.184 J/(g·°C), and that there is negligible heat loss to the surroundings. 1. How much heat was absorbed by the solution? q = ____ kJ 2. What is the enthalpy of the reaction? Δ?rxn = _____ kJarrow_forward
- Calculate the heat change in calories for condensation of 13.0g of steam at 100 degreesarrow_forward1.) If a 50g sample of water at a temperature of 100 oC is added to a 25g sample of water at 25 oC, what would be the equilibrium temperature? The specific heat of water is 4.184 J/g oC.arrow_forwardEthylene glycol (C2H6O2), also known as antifreeze, is a liquid coolant added to water in vehicle radiators to reduce the likelihood of overheating. How many mL of antifreeze would be required in 300 mL of water in a car radiator to achieve a boiling point no greater than 106 ᴼC? The Kb and normal boiling point of water are 0.52 ᴼC/m and 100ᴼC, respectively, per your reference table. The density of ethylene glycol is 1.11 g/mL. Assume a density of 1g/mL for water.arrow_forward
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