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You Have 500 mL of a buffer solution containing .2 M CH3COOH and .3 M CH3COONa. What will the pH of this solution be after the addition of 20 mL of 1.00 M NaOH solution? (Ka=1.8x10^-5)
If the barometric pressure is 784 torr and the experiment is carried out at 25 oC, what is the pressure of the gas collected?
The dry sample of gas had a mass of 4.20 g. At 21 degrees celsius the vapor pressure of water is 18.65 torr. What was the molecular weight of the gas?
a piece of gold jewelry that weighs 9.35 g and has a volume of 0.654 cm3. The density of pure gold is 19.3 g/cm3 and the density of pure silver is 10.5 g/cm3. Find the percent composition of gold an
An aqueous solution of a nonelectrolyte boils at 100.32C. What is its expected freezing point?
Ethylene glycol, HOCH2CH2OH, is effective as an antifreeze, but it also raises the boiling temperature of automobile coolant. What is the freezing point of a 50.0% solution of ethylene glycol in water
When relatively small amounts of magnesium burn, the fires are extinguished using commercially available dry powder. Why might this fire rekindle days later as someone tries to remove the residue wi
A gas expands and does P-V work on the surroundings equal to 343 J. At the same time, it absorbs 159 J of heat from the surroundings. Calculate the change in energy of the gas.
A 37.4-L volume of methane gas is heated from 22 degrees C to 78 degrees C at constant pressure. What is the final volume of the gas?
Solid NaHCO3 is heated to 90°C. At equilibrium the total pressure of the gases produced is 0.545 atm. Calculate ΔG° at 90°C for the reaction
(This is the volume that could come out of solution suddenly, causing the painful and dangerous condition called the bends, if the diver were to ascend too quickly.) Assume that Henry's constant for
What affect would each of the following changes in procedure have had on the calculated percentage of fat found for your meat product?
A gas-filled balloon having a volume of 2.50 L at 1.2 atm and 25°C is allowed to rise to the stratosphere (about 30 km above the surface of Earth), where the temperature and pressure are -23°
If a bottle of nail polish remover contains 172mL of acetone, how much heat would be released by its complete combustion? The density of acetone is 0.788g/mL .
Calculate the amount of heat needed to boil 50.6g of ethanol (CH3CH3OH), beginning from a temperature of 24.4C . Round your answer to 3 significant digits. Also, be sure your answer contains a unit
Calculate the mass of propylene glycol that must be added to .360 kg of water to reduce the vapor pressure by 2.87 torr at 40 degrees celsius (Ph20 at 40 degrees = 55.3)
Water boils at 373 K.The molar enthalpy of vaporation for water is 40,7 kJ/mo1.If one mole of water is at 373 K when it starts to boil its temperature when it all has boiled will be?
If you had a saturated solution of NaNo3 at 40 degrees Celsius that contained 85 grams of water, how much of the salt would you need to add to have a saturated solution at 70 degrees Celsius?
Calculate the volume of oil spilled in L and in barrels and calculate the percentage the total of the oil spill was compared to daily use in the USA. (c) If all of this carbon were converted to CO2,
A assessor is measuring the perimeter of a rectangular lot. He measures two adjacent sides to be 50.11 ± 0.05 m and 75.12 ± 0.08m. These measurements are independent. Estimate the per
A vertical line on a phase diagram indicates that a compound is formed with a distinct chemical formula corresponding to the line's position on the graph.
Calculate the energy levels of the pi-network in octatetaene, C8H10, using the particle in the box model. To calculate the box length, assume that the molecule is linear and use the values 135 and 1
Compute the equilibrium constant, Keq, for the reaction of equimolar amounts of acetophenone, C6H5COCH3, and hydroxide ion to generate the enolate ion.
The solubility of oxygen in water is 14.74mg/L at 0 celcius and 7.03mg/L at 35 celcius. Estimate the solubility at 50 celcius.