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Sodium hydroxide is a common ingredient in drain cleaners such as Drano. The mole fraction of sodium hydroxide in a saturated aqueous solution is 0.310. What is the molality of the solution?
The standard molar enthalpy of vaporization for water is 40.79 kJ/mol. What mass of steam is required to release 500. kJ of energy upon condensation?
Procaine hydrochloride (M = 272.77 g/mol)is used as a local anesthetic. Calculate the molarity of a 4.666 m solution which has a density of 1.1066 g/mL.
Compute the wavelength of the radio waves from the following stations. An AM station operating at a frequency of 710 kHz, An FM station wiht a frequency of 96.3 MHz.
5.0 g of H2O at 23.0 oC is added to 100.0 g of H2O at 67.5 oC.What is the temperature of the resulting mixture.
Draw a Newman projection for stilbene dibromide. Is this isomer of stilbene dibromide chiral?
What is the percent ionization of ephedrine hydrochloride with pka of 9.6 in the intestinal tract buffered at PH 8?
The heat of reaction for the combustion of cyclohexane, C6H12, is 936.8 kcal/mol. What is the heat of combustion for cyclohexane in kcal/gram?
A beaker with 2.00×102 of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. How much will the pH change? The of acetic acid is 4.760.
Suppose 8.00 g of CH4 is allowed to burn in the presence of 8.00 g of Oxygen. How much (in grams) of CH4, O2, CO2, and H2O remain after the reaction is complete?
Given that the most common mineral in limestone is calcium carbonate, describe how these limestone objects are corroded by the sulfuric acid in polluted air. What chemical reaction is involved here?
Combustion analysis of naphthalene, a hydrocarbon used in mothballs, produced 8.80 g CO2 and 1.44 g H2O. Calculate the empirical formula for naphthalene?
Determine how many mL of solution A (acetic acid-indicator solution) must be added to solution B (sodium acetate-indicator solution) to obtain a buffer solution that is equimolar in acetate and acet
A 295- flask contains pure helium at a pressure of 751 . A second flask with a volume of 495 contains pure argon at a pressure of 712 . If the two flasks are connected through a stopcock and the sto
The temperature of a 35.2 g sample of iron increases from 23.7 °C to 29.5 °C. If the specific heat of iron is 0.450 J/g-K, how many joules of heat are absorbed?
Suppose after developing the color of your unknown compound, the Spec 20 cannot measure the absorbance, it is too high. How could you obtain the concentration of Cr(NO3)3 in your sample?
Calculate the volume of 6.15% (mass solute/volume solution) sodium hypochlorite ("bleach") that will be required to make 250 mL of 0.500 M sodium hypochlorite.
A calorimeter containing 75 grams of water ai 18 degrees celcius. the water and metal object reach a final temperature of 22 degrees celcius? what is the metal?
Calculate the maximum theoretical percent recovery from the recrystallization of 0.75g of benzoic acid from 15mL of water at 100 degrees C and filtration at 25 degrees C.
An air bubble accidentally enters the co2 collection graduated cylinder after the completion of the reaction. How does this error affect the reported moles of CO2(g) collected?
How many cycles of the citric acid cycle are required to completely oxidize all the pyruvate formed when a molecule of glucose undergoes glycolysis?
An NaOH}(aq) solution cannot be made up to an exact concentration simply by weighing out the required mass of NaOH, because the NaOH is not pure. Also, water vapor condenses on the solid as it is be
You make a solution of potassium sulfate by mixing 243g of k2so4 in 2.00L of water in a beaker. what is the molarity of the resulting solution, assuming all of the solute dissolves?
In an experiment 7.220 g of silicon dioxide is reacted with 15.018 g of hydrogen fluoride gas according to the equation.
A 35.00 mL sample of HNO3 solution is neutralized by exactly 42.63 mL of 0.4153 M KOH. What is the molarity of the HNO3 solution?