When ionic compound AB (12.0 g) is dissolved in water, it absorbs 2.00 kj of heat. The compound has a heat of hydration of -670 kj mol1. Determine the lattice energy of AB. (Molar mass of AB: 120.0 g mol) O 690 kj mol O 650 kj mol-1 -650 kj mol1 O 690 kj mol"1
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- You are given a solution of 0.117 M NaOH solution. You need to neutralize 10.00 mL of the NaOH solution with an acid called KHP. The reaction is: KHP+ NaOH --> H2O + a salt If you are going to make up a KHP stock solution in a 100.00 mL Volumetric flask and use 14.137 mL of the KHP stock solution to neutralize the NaOH, what mass of KHP would you need to use? The molar mass of KHP is 204.22 g/moleA solution contains 2.2 x 10 -3 M in Cu2+ and 0.33 M in LiCN. If the Kf for Cu(CN)42- is 1.0 x 1025 , how much copper ion remains at equilibrium?Solid iron(II) fluoride (FeF2, Ksp= 2.36 x 10-6) is dissolved in water. If 8.1 x 10-3 mol L-1 of iron(II) ion is found to be in solution. Is the solution saturated, unsaturated, desaturated or supersaturated.
- How many grams of calcium chloride (CaCl2; molecular weight = 111 g mole−1) would you dissolve in water to make a 0.111 M CaCl2 solution with 1 L final volume? gHow many grams of calcium chloride (CaCl2; molecular weight = 111 g mole−1) would you dissolve in water to make a 0.2 M CaCl2 solution with 200 mL final volume? gA sample of KNO3 ( 225 g) is completely dissolved in water (250 g) at 333.15 K. The solution is gradually colled to 273.15 K. At this coller temperature, KNO3 solubility in H2O is 12.1 g/100 g H2O. What mass of KNO3 (in g) will crystallize out of the solution at 273.15 K?
- The enthalpy of combustion of hard coal averages −35 kJ/g, that of gasoline, 1.28 × 105 kJ/gal. How many kilograms of hard coal provide the same amount of heat as is available from 1.0 gallon of gasoline? Assume that thedensity of gasoline is 0.692 g/mL (the same as the density of isooctane).The concentration of a certain sodium hydroxide solution was determined by using the solution to titrate a sample of potassium hydrogen phthalate (abbreviated as KHP). KHP is an acid with one acidic hydrogen and a molar mass of 204.22 g/mol. In the titration, 58.23 mL of the sodium hydroxide solution was required to react with 0.3520 g KHP. Calculate the molarity of the sodium hydroxide. Molarity = __________ MLisa and Jisoo wanted to prepare 150 mL of 0.650 M malonate buffer pH 5.00 by mixing NaC4H304 and Na2C3H204. Relevant Reaction: Ка, 3 1.4x10з Kaz = 2.0x10 6 C;H,O4 2 C,H;O4 1. What mass of solid NaC3H3O4 (MM = 138.054 g/mol) and solid Na2C3H2O4 (MM = 148.026 g/mol) will be needed to prepare the buffer? a. mass of solid NaC3H3O4 needed: b. mass of solid NazC3H2O4 needed: g
- When 0.5 mol of a certain ionic substance is dissolved in 1.0 kg of water, the freezing point of the resulting solution is -2.8 °C (270.35 K), How many ions does the substance give when it dissolves?An unknown mixture is known to contain only Ba(OH)2 (MW=171.34 g/mole) and NaOH (MW=40.0 g/mole). If the mixture is known to contain 45% by mass NaOH, and 8.0 grams of the mixture is dissolved completely in 50.0 ml of solution, answer the following. c).If 10.0 ml of a 0.2 M solution of Na2SO4 was added to the 50.0 ml solution, what would be the final concentration of Na+ in solution.The kf of water is 1.86 kg °C/mol, approximately 4x the value of kp. If you attempted to freeze your 1.3m solution, how do you think the freezing point of water would be impacted?