1. Potassium nitrate has a lattice energy of -163.8 kcal/mol and a heat of hydration of...
1. Potassium nitrate has a lattice energy of -163.8 kcal/mol and a heat of hydration of -155.5 kcal/mol. How much potassium nitrate has to dissolve in water to absorb 112 kJof heat?
2. Calculate the mass of nitrogen dissolved at room temperature in an 97.0 Lhome aquarium. Assume a total pressure of 1.0 atmand a mole fraction for nitrogen of 0.78.
3. Use Henry's law to determine the molar solubility of helium at a pressure of 2.0 atmand 25 ∘C. Henry’s law constant for helium gas in water at 25 ∘Cis 3.70⋅10−4M/atm.
4. Lead is a toxic metal that affects the central nervous system. A Pb-contaminated water sample contains 0.0012 %Pbby mass. How much of the water (in mL) contains 140 mgof Pb? (Assume a density of 1.0 g/mL.)
5. One brand of laundry bleach is an aqueous solution containing 4.00% sodium hypochlorite (NaOCl)by mass. What is the molarity of this solution? (Assume a density of 1.02 g/mL.)
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1. Potassium nitrate has a lattice energy of -163.8 kcal/mol and
a heat of hydration of...
Potassium nitrate has a lattice energy of -163.8 kcal/mol and a heat of hydration of -155.5...
Potassium nitrate has a lattice energy of -163.8 kcal/mol and a heat of hydration of -155.5 kcal/mol. How much potassium nitrate has to dissolve in water to absorb 115kJ of heat? Express your answer using two significant figures. (in kg)
Potassium nitrate has a lattice energy of -163.8 kcal/mol and a heat of hydration of -155.5...
Potassium nitrate has a lattice energy of -163.8 kcal/mol and a heat of hydration of -155.5 kcal/mol. You may want to reference (pages 551 - 555) section 12.3 while completing this problem. How much potassium nitrate has to dissolve in water to absorb 109 kJ of heat? Express your answer using two significant figures.
Potassium nitrate, KNO,, has a molar mass of 101.1 g/mol. In a constant-pressure calorimeter, 25.9 g...
Potassium nitrate, KNO,, has a molar mass of 101.1 g/mol. In a constant-pressure calorimeter, 25.9 g of KNO, is dissolved in 319 g of water at 23.00 °C. KNO,() K+(aq) + NO (aq) The temperature of the resulting solution decreases to 20.90 °C. Assume that the resulting solution has the same specific heat as water, 4.184 J/(g: "C), and that there is negligible heat loss to the surroundings. How much heat was released by the solution? What is the enthalpy...
Potassium nitrate, KNO3, has a molar mass of 101.1 g/mol. In a constant-pressure calorimeter, 23.0 g...
Potassium nitrate, KNO3, has a molar mass of 101.1 g/mol. In a constant-pressure calorimeter, 23.0 g of KNO, is dissolved in 383 g of water at 23.00 °C. HO KNO,(s) + (aq) + NO3(aq) The temperature of the resulting solution decreases to 18.40 °C. Assume that the resulting solution has the same specific heat as water, 4.184 J/(g. "C), and that there is negligible heat loss to the surroundings. How much heat was released by the solution? Poln What is...
Potassium nitrate, KNO3, has a molar mass of 101.1 g/mol. In a constant-pressure calorimeter, 44.1 g...
Potassium nitrate, KNO3, has a molar mass of 101.1 g/mol. In a constant-pressure calorimeter, 44.1 g of KNO3 is dissolved in 221 g of water at 23.00 °C. KNO3(s) to K+ (aq) + NO3- (aq) The temperature of the resulting solution decreases to 21.20 °C. Assume the resulting solution has the same specific heat as water, 4.184 J/(g·°C), and that there is negligible heat loss to the surroundings. How much heat was released by the solution? How much heat was released...
part 1) An aqueous solution of magnesium nitrate, Mg(NO3)2, contains 2.03 grams of magnesium nitrate and...
part 1) An aqueous solution of magnesium nitrate, Mg(NO3)2, contains 2.03 grams of magnesium nitrate and 17.8 grams of water. The percentage by mass of magnesium nitrate in the solution is %. part 2) The mole fraction of lead acetate, Pb(CH3COO)2, in an aqueous solution is 1.80×10-2 . The percent by mass of lead acetate in the solution is %. part 3) An aqueous solution is 40.0 % by mass potassium bromide, KBr, and has a density of 1.37 g/mL. The mole...
The change in enthalpy for dissolving ammonium nitrate in water is 26 kJ/mol. Determine the amount...
The change in enthalpy for dissolving ammonium nitrate in water is 26 kJ/mol. Determine the amount of ammonium nitrate (in grams) that was dissolved in water to make 50.0 mL of solution if the temperature of a coffee cup calorimeter changes from 25.3°C to 21.5°C. Assume the density of the solution is 1.0 g/mL and the heat capacity of the solution is 4.2 J/g°C.
For the unbalanced combustion reaction shown below, 1 mol of ethanol, C2H5OH, releases 327 kcal (1370...
For the unbalanced combustion reaction shown below, 1 mol of ethanol, C2H5OH, releases 327 kcal (1370 kJ). C2H5OH+O2→CO2+H2O How much heat (in kilocalories) is released from the combustion of 7.38 g of ethanol? How many grams of C2H5OH must be burned to raise the temperature of 360.0 mL of water from 20.0 ∘C to 100.0 ∘C? (The specific heat of water is 1.00 cal/g⋅∘C or 4.184 J/(g⋅∘C). Assume the density of water at 20.0∘C is 1.00 g/mL.
help on questions 26-30 26. Which of the following concentration units will not change with temperature:...
help on questions 26-30
26. Which of the following concentration units will not change with temperature: molarity, percent mass, mole fraction, and molality. 27. Calculate the percent by mass of potassium nitrate in a solution made from 45.0 g KNO3 and 295 mL of water. The density of water is 0.997 g/mL. A) 1.51 % B) 7.57 % C) 13.3 % D) 15.2 % E) None of these 28. What is the molarity of a solution that is 5.50% by...
Part 1. The air in a bicycle tire is bubbled through water and collected at 25∘C. If the total volume of gas collected i...
Part 1. The air in a bicycle tire is bubbled through water and collected at 25∘C. If the total volume of gas collected is 5.60 L at a temperature of 25∘C and a pressure of 760 torr, how many moles of gas were in the bicycle tire? - Part 2. A 295-mL flask contains pure helium at a pressure of 755 torr . A second flask with a volume of 480 mL contains pure argon at a pressure of 714...
Potassium nitrate has a lattice energy of -163.8 kcal/mol and a heat of hydration of -155.5 kcal/mol. You may want to reference (pages 551 - 555) section 12.3 while completing this problem. How much potassium nitrate has to dissolve in water to absorb 109 kJ of heat? Express your answer using two significant figures.
Potassium nitrate, KNO,, has a molar mass of 101.1 g/mol. In a constant-pressure calorimeter, 25.9 g of KNO, is dissolved in 319 g of water at 23.00 °C. KNO,() K+(aq) + NO (aq) The temperature of the resulting solution decreases to 20.90 °C. Assume that the resulting solution has the same specific heat as water, 4.184 J/(g: "C), and that there is negligible heat loss to the surroundings. How much heat was released by the solution? What is the enthalpy...
Potassium nitrate, KNO3, has a molar mass of 101.1 g/mol. In a constant-pressure calorimeter, 23.0 g of KNO, is dissolved in 383 g of water at 23.00 °C. HO KNO,(s) + (aq) + NO3(aq) The temperature of the resulting solution decreases to 18.40 °C. Assume that the resulting solution has the same specific heat as water, 4.184 J/(g. "C), and that there is negligible heat loss to the surroundings. How much heat was released by the solution? Poln What is...
help on questions 26-30
26. Which of the following concentration units will not change with temperature: molarity, percent mass, mole fraction, and molality. 27. Calculate the percent by mass of potassium nitrate in a solution made from 45.0 g KNO3 and 295 mL of water. The density of water is 0.997 g/mL. A) 1.51 % B) 7.57 % C) 13.3 % D) 15.2 % E) None of these 28. What is the molarity of a solution that is 5.50% by...
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