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The enthalpy of formation of ethanol, C2H5OH, is -277.0 kJ/mol at 298.15k. calculate the enthalpy of combustion of one mole of ethanol, assuming that the products are CO2 (g) and H2O.
A patient weighs 165 pounds and is to receive a drug at a dosage of 45.0 mg per kg of body weight. The drug is supplied as a solution that contains 25.0 mg of drug per mL of solution. How many mL of
69.7 grams of solute with a molecular mass of 2790 grams are dissolved in enough water to make 1.00 dm3 of solution at 20 degrees Celsius. What is the osmotic pressure of the solution?
Nitroglycerine, C3H5(NO3)3(l), a powerful explosive used in mining, detonates to produce a hot gaseous mixture of nitrogen, water, carbon dioxide and oxygen.
Calculate the molarity of a solution made by dissolving 0.850 grams of Na2SO4 in enough water to form exactly 930 mL of solution.
A 2.9 m solution of methanol (CH3OH) in water has a density of 0.984 g/ml. What are the a) mass percent, b) molarity, and c) mole fraction of methanol in this solution?
A 10.0 mL sample of vinegar, an aqueous solution of acetic acid, is titrated with 0.5062 M NaOH, and 16.58 mL is required to reach the equivalence point.
a sample of nitrogen gas occupies 1.55 L at 27.0 C and 1.00 atm pressure. What will the volume be -100 C and the same pressure?
Ammonia is both a donor and an acceptor of hydrogen in hydrogen-bond formation. Draw a diagram showing the hydrogen bonding of an ammonia molecule with two other ammonia molecules.
When .192 g of phosphorus reacts with oxygen, .440 g of a white oxide is formed. How many grams of oxygen reacted with the phosphorus?
A 2.10-g sample of a large biomolecule was dissolved in 14.0 g of carbon tetrachloride. The boiling point of this solution was determined to be 77.85°C. Calculate the molar mass of the biomolec
What is the final temperature of the solution in C? Assume that the specific heats of both pure H2O and the solution are the same, 4.18J/K.
calculate the pOH and the pH when 45.0mL of 3.00 mol/L potassium hydroxide solution is diluted by adding 100.0 mL of water.
A 45 g piece of ice at 0 C is added to a sample of water at 19C. All of the ice melts and the temperature of the water decreases to 0C . how many grams of water were in the sample?
Ammonia gas at 223°C and 90. atm flows into a reactor at a rate of 550. L/min. Carbon dioxide at 223°C and 47 atm flows into the reactor at a rate of 600. L/min. What mass of urea is produce
The equilibrium constant, Kp for the decomposition of nitrogen dioxide is 4.48 * 10-13 at 250C. What is the Kc for that reaction at the same temperature? 2NO2(g) <=> 2NO(g) + O2(g).
In the topic of calorimetry, how can bumping be avoided when heating water in a beaker?
A small bubble rises from the botton of a lake, where the temperature and pressure are 4°C and 3.0 atm, to the water's surface, where the temperature is 25°C and pressure is 0.95 atm. Calculate the fi
Solid silicon and solid magnesium chloride form when silicon tetrachloride gas reacts with magnesium metal. Write a word equation and an unbalanced formula equation. Include all of the appropriate
What is the boiling point of the solution in which you are going to cook spaghetti if it contains 58.0 g of NaCl dissolved in 1.20 L of water?
Calculate the heat change at 100C in each of the following problems. Indicate whether heat was absorbed or released.
What is the percent by mass of NaHCO3 in a solution containing 30 g of NaHCO3 dissolved in 500 mL of H2O?
The hydrogen gas generated is collected over water at 25 C. The volume of the gas is 246 mL measured 1.00 atm. Calculate the number of grams of sodium used in the reaction.
A student was as ked to determine the molecular weight of a weak monoprotic dry acid (HX). She was provided the following laboratory equipment.
Calculate the molarity of a solution of glycerol made by dissolving 50.000 glycerol at 15 in enough water to make 330.00 of solution.