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How many grams of a stock solution that is 87.5 percent H2SO4 by mass would be needed to make 275 grams of a 55.0 percent by mass solution? Show all of the work needed to solve this problem.
What does a negative electron affinity mean? What does a positive electron affinity mean?
The reaction will be spontaneous until some NO forms in the mixture. What maximum partial pressure of NO builds up before the reaction ceases to be spontaneous?
The mixture is analyzed and is found to contain 1.27 mol co2 , and 3.40 mol co and 1.50 mol ar what is the partial pressure of ar?
The solution will turn blue-black at four different times. Each time, the concentration of iodine ion will have changed by 0.0020 mol/L. What is the cumulative change in concentration of iodide ion
How many grams of PH3 can form when 37.5 g of phosphorus and 83.0 L of hydrogen gas react at STP? (balance the equation)
Predict the lattice constant (a) and compare with the value of (a) calculated from the observed density of CsCl, 3.97 gm/cm3.
Write the balanced equation for the saponification of glyceryl tristearate with aqueous sodium hydroxide
calculate the mass of air in an air-filled tire and the mass of helium in a helium-filled tire. What is the mass difference between the two?
From the volume of NaHCO3 solution used and the initial mass of NaHCO3 used, determine the mass of NaHCO3 present in each trial. Calculate the moles of NaHCO3 present in each trial you conducted.
A 32.0-g sample of water at 290. K is mixed with 48.0 g water at 310. K. Calculate the final temperature of the mixture assuming no heat loss to the surroundings.
Calculate the fraction of atoms in a sample of argon gas at 499 K that have an energy of 12.7 kJ or greater
What is the mass of the solid NH4Cl formed when 73.0 g of NH3 are mixed with an equal mass of HCl? What is the volume of the gas remaining, measured at 14.0° C and 752 mmHg?
Write an equation for the dissociation of AgCl in water.
A 5.0 L flask is filled with 0.25 mol SO3, 0.50 mol SO2, and 1.0 mol O2, and allowed to reach equilibrium. Assume the temperature of the mixture is chosen so that Kc = 0.12. Predict the effect on th
If the absorbance of the solution at 460 nm is 0.938, and the absorbance of the solution at 550 nm is 0.713, calculate the concentration of each dye.
A compound is found to be 30.45% N and 69.55 % O by mass. If 1.63 g of this compound occupy 389 mL at 0.00°C and 775 mm Hg, what is the molecular formula of the compound?
Calculate the necessary dilutions to make a 2mg/mL standard solution and a 12 mg/mL standard solution. All standard solutions must have a total volume of at least 8 mL.
A gas has a pressure of 4.82035 atm when its volume is 2.75 L. What will the pressure be when the volume is changed to 1.91015 L, assuming constant temperature? Express the final pressure in torr.
as gas expands from 1.00 L to 2.50 L against constant pressure of 820 torr. Calculate the change in internal energy for the gas, if 120 J of heat is transferred to the gas during the expansion?
If a student has a non-zero blank correction, but forgets to include that correction in his/her calculations: Would his/her calculated [EDTA] be correct, too high, or too low?
Gaseous ammonia NH3 reacts with gaseous oxygen to form gaseous nitrogen monoxide and gaseous water. Write a balanced chemical equation.
Calculate the overall free energy for this reaction,DeltaG using the physiological conditions in a red cell at 37C.Given
Construct a rough plot of pH versus volume of base for the titration of 25.0 mL of 0.050 M HCN with 0.075 M NaOH