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A 0.481 gram sample of an unknown acid (HX) required 28.95mL of 0.2103M NaOH for neutralization to a phenolphthalein endpoint. What is the molar mass of the acid?
Determine angle A to the nearest tenth of a degree when sin A =0.4552
At a certain temperature, Kc = 1.30 1010 for the reaction above. Calculate the equilibrium concentration of H2S if [H2] = 0.00360 M and [S2] = 0.00290 M at equilibrium in a container.
Consider the gas phase decompositon reaction of 2NOCl----> 2NO +Cl2. The concentrations of NOCl and Cl2 are plotted below for the reaction at 500K. What is the average rate of the reaction over 0
How many grams of CaCl2 were added? Assume the volume of the solution is not changed significantly by the addition of the CaCl2. Ksp CaSO4 = 2.4 x 10-5
The (Br-) of the resulting solution is 0.672M. Assuming the volume is additive, calculate the molarity of the first solution.
Calculate the mass of ethylene glycol (C2H6O2) that must be added to 1.00 kg of ethanol (C2H5OH) to reduce its vapor pressure by 12.0 torr at 35*C. The vapor pressure of pure ethanol at 35*C is 1.00
What is the partial pressure of carbon dioxide in a container that contains 7.64 mol of oxygen, 1.68 mol of nitrogen, and 1.42 mol of carbon dioxide when the total pressure is 529 mmHg?
When answering, include an explanation, balanced chemical equations and/or calculations where appropriate. What volume of 0.1037M HCL is necessary to neutralize 0.3643 grams Ca(OH)2? Include a balance
The solubility of oxygen in water is about 4.5 x 10^ -2 g/L. The water portion of an adult's total blood supply is about 5 liters. How many grams of oxygen could dissolve in 5 liters of water?
When answering, include an explanation, balanced chemical equations and/or calculations where appropriate. Calculate the molar concentration of propionic acid (HC3H5O2) in solution if 10.00mL of a p
What is the pH of a solution prepared by dissolving 2.89 g of calcium nitrite in 0.675 L of water? Briefly explain which ions (Ca2+ or NO2- or both?) will hydrolyze.
If the rate that hydrogen chloride is being lost is 0.10 M/s, what is the rate that molecular oxygen is being lost? If the rate that water vapor is being formed is 0.35 M/s, what is the rate that hydr
Neither the VSEPR model nor the hybridization model is able to account for the experimental observation that the F-Ba-F bond angle in gaseous BaF2 is 108° rather than the predicted 180°
If one slice of chocolate cake contain 35g of carbohydrate,15g of fatand 5 g of protein. Calculate the kilocalories that each slice of cake contain.
What is the effect of an insoluble substance such as sand or charcoal? What is the temperature of the vapor above these two boiling solutions?
Question: What is the pressure (in atmospheres) of the gas inside the container connected to an open-end, mercury-filled manometer as shown in the picture? The atmospheric pressure is 0.95 atm.
A 0.0750 M solution of a monoprotic acid is known to be 12.4% ionized. What is the pH of the solution?
A 0.0750 M solution of a monoprotic acid is known to be 12.2% ionized. What is Ka for the acid?
How many kilojoules of heat energy would be liberated if 220.6 g of propane were combusted in the presence of 320.0 g of oxygen given the balanced chemical equation below and its corresponding entha
How do you predict the charge on an ion most likely to form from any main group atom?
Write the missing formulas in the chemical equations
For the reaction: 2HI(g) ? H2(g) + I2(g) Keq = 0.016 Initially a container contains 0.60 M HI, 0.038 M H2, and 0.15 M I2 at equilibrium. What is the new equilibrium concentration of H2, if the H2 co
How long does it take a person at rest to breathe one mole of air if the person breathes 80.0mL/s of air that is measured at 25C and 755mm Hg ?
Question: When heated, calcium carbonate decomposes to yield calcium oxide and carbon dioxide gas via the reaction