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calculate the final temperature of a mixture of 130.0g of ice initially at -22.5 Celsius and 310.0g of water initially at 80.5 Celsius.
Calculate the pH of the stock acetic acid solution if [Acetic Acid] = 1.012 mol/L. pKa of acetic acid = 4.75.
What mass of sucrose should be combined with 464 g of water to make a solution with an osmotic pressure of 8.35 atm at 320 K? (Assume the density of the solution to be equal to the density of the so
Which of the following correctly lists these four types of interactions/forces according to increasing strength (weakest to strongest)?
How much heat is required to warm 227 g of ice from -44.5°C to 0.0°C, melt the ice, warm the water from 0.0°C to 100.0°C, boil the water, and heat the steam to 173.0°C?
A solution is prepared by dissolving 13.3 g ammonium sulfate in enough water to make 100.0 mL of stock solution. A 11.50 mL sample of this stock solution is added to 56.00 mL of water. Calculate the
Determine the equivalence point from the expanded first derivative graphs and calculate the concentration of the unknown vinegar solution
Would you expect smelling salts to work as well on a cold winter day as on a warm summer day? Explain your answer.
What is the name of the product for the pinacolone + piperonaldehyde + KOH reaction? It's a mixed aldol condensation reaction. I was able to come up with the product structural formula but not the
The partial pressure of 222Rn was 1.2 10-6 mmHg. Calculate the number of 222Rn isotopes (t1/2 = 3.8 d) at the beginning and end of 27 days.
Heat is lost to the styrofoam calorimeter. Assuming a 6.22 C temperature change for the reaction of HCl(aq) with NaOH(aq), calculate the heat loss to the inner 2.35-g styrofoam cup. The specific hea
A calorimeter contains 32.0 of water at 15.0. When 2.50 of (a substance with a molar mass of 52.0 ) is added, it dissolves via the reaction and the temperature of the solution increases to 26.0. Ca
Many cigarette lighters contain liquid butane)Using enthalpies of formation, calculate the quantity of heat produced when 3.80 g of butane is completely combusted in air under standard conditions.
Two 2.00L flasks, one of which contains 0.250 mole O2 gas at 50.0 deg C. In which flask is the ratio of molecular volume to sample volume greater?
A 0.041 M solution of a monoprotic acid is 12 percent ionized. Calculate the ionization constant of the acid.
Rubidium-87 decays by beta decay with a half-life of 4.9 x 10^10 yr. How many 87Rb atoms are in a moon rock sample that has a rubidium decay rate of 3500 disintegrations per hour.
An aqueous solution contains 4.90% NH3 (ammonia) by mass. The density of the aqueous ammonia is 0.979 g/mL. What is the molarity of NH3 in the solution?
A 0.264-gram sample of an amino acid was dissolved in 95.0mL of water and titrated with 0.105M NaOH. The first equivalence point was found at V(OH)=16.3mL. What is the molar mass of the amino acid t
Consider the following reaction: K2S(aq)+ Co(NO3)2(aq) - 2 KNO3(aq) + CoS(aq) What volume of 0.225 M K2S solution is required to completely react with 175 mL of 0.115 M Co(NO3)2?
A 1.43-L flask is filled with propane gas (C3H8), at 1.00 atm and -23.0°C. What is the mass of the propane in the flask?
Calculate the total entropy change for the contents of the bath (ice, water, and nickel). NOTE: enthalpy of fusion of ice = 334. J g-1. Specific heats at constant pressure: nickel, 0.46 J K-1 g-1.
A solution was made by taking 1.250g of KMnO4 and dissolving it in enough water to make 1.000 liter of solution. How many mL of this solution are required to titrate a 0.480 g sample of H2C2O4·
The Base composition for one of the strands of the DNA double helix is 25%A, 35%C, 18%G, and 22%T. What is the percent base composition for the other strand of the DNA double helix?
Calculate the percentage of empty space in 1 mol of water at 25C. Obtain the density from the experiment " Some Measurements of Mass and Volume."
What is the equilibrium partial pressure (in atm) of H2S if a solid sample of NH4HS is placed in a closed container and allowed to reach equilibrium at 295 K.