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If the concentration of potassium chloride in water is 113 ppm, what is the molarity of potassium chloride in water? The molar mass of KCl is 74.55 g/mol. Assume the density of the solution is 1.00
At 25 °C, what is the osmotic pressure of 8.65 g urea (CON2H4) diluted with water to 1.50 L? (R = 0.08206 L·atm/mol·K)
The heat of formation of KCl(s) is -436.7 kJ/mol and the heat of formation of KCl(aq, 1 m) is -419.5 kJ/mol. Determine the heat of solution of KCl.
What is the freezing point of a solution containing 4.78 grams naphthalene (molar mass = 128.2 g/mol) dissolved in 32.0 grams paradichlorobenzene? The freezing point of pure paradichlorobenzene is
The molar heat capcities of iron and gold are 25.19 J/(mol degree C) and 25.41 J/(mol degree C), respectively. What is the final temperature of the water and the pieces of metal?
An electrically heated coil with a resistance of 60 operated from a 110 V line. A thermoregulator switches the current on and off. What fraction of the time will the current be turned on?
For the following reaction, 5.21 grams of nitrogen gas are allowed to react with with 5.51 grams of hydrogen gas. What is the maximum amount of ammonia that can be formed?
The osmotic pressure of the glucose solution must equal the osmotic pressure of blood. (R = 0.08206 L·atm/mol·K)
Determine the values of delta(x)=(<x^2>-<x>^2)^1/2 and delta(p)=(<p^2>-<p>^2)^1/2 for (a) a particle in a box of length L and (b) a harmonic oscillator. (c) Discuss these wi
The Henry's law constant for N2 in water at 37 °C is 8.2 ´ 10-7 M/mm Hg. What is the equilibrium concentration of N2 in water when the partial pressure of N2 is 634 mm Hg?
Sulfur-38 has an atomic mass of 38.0 and a half-life of 2.87 hours. How long will it take for 99.99% of a sample of sulfur-38 to decay?
A volume of 80.0mL of H2O is initially at room temperature (22.0 °C). A chilled steel rod at 2.00 °C is placed in the water. If the final temperature of the system is 21.5 °C , what is the mass of t
copper metal (molar mass 63.55 g mol-1) fell by 7.51 K when the copper block released 13.6 J of heat. What is the mass of the copper block?
An unknown compound contains only carbon, hydrogen, and oxygen (C_xH_yO_z). How many moles of hydrogen, H, were in the original sample?
The sudden opening of the epiglottis and vocal cords releases this air explosively. Just prior to this release, what is the approximate pressure of the gas inside the lungs?
When the molten liquid solidified, the melting point was re-determined and found to be 131oC. Give a possible explanation for this discrepancy.
How many milliliters of a stock solution of 6.20 M HNO3 would you have to use to prepare 0.200L of 0.530 M HNO3?
The equilibrium constant of this reaction is K = 1.0, and that the initial pressure of A was 1 atm, what change in the gas pressure in the reaction chamber do you expect?
A 78 L sample of dry air is cooled from 138°C to -33°C while the pressure is maintained at 2.85 atm. What is the final volume?
The gas phase reaction 2A → P in which the product, P is formed when two A molecules collide. What does it mean when it said "increase by a factor of 9"? Where is 9 comes from?
When 125 g of copper reacts with 34 g of oxygen gas to form copper (II) oxide, no copper or oxygen is left over. How much copper (II) oxide is produced?
When synthesizing epoxy resin, amines are used as the curing agent. Amines react rather quickly with epoxy groups. How might you slow the reaction down? How might you speed it up?
Phenylacetic acid (C6H5CH2COOH, simplified here to HPAc) builds up in the blood of persons with phenylketonuria, an inherited disorder that, if untreated causes mental retardation and death. A study
You have some metal shot (small spheres about 5 mm in diameter), and you want to identify the metal. What metal is in the spheres? (Assume that the spheres are all the same and consist of pure metal.)
1.00 L each of separate solutions of 0.3 M KCl, 0.1 M AgClO4 and 0.1 M Pb(NO3)2 are mixed into one container. Give the formulas of the precipitate formed and give the formulas of the spectator ions.