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Calculate the concentration of arsenic in ppb in a 0.05 mg/L solution. Assuming that the solution is entirely water and density of the solution is 1.0 g/mL.
Assume that 3.0g of aniline and 4.5 mL of acetic anhydride are used in the preparation of acetanilide according to the following equation. What is the limiting reagent?
The bond length in an HI molecule is 1.61 angstrom and the measured dipole moment is 0.44 D. What is the magnitude (in units of e) of the negative charge on I in HI? (1 debye=3.34x10^-30 Cm; e=1.6x1
A 10.0 g piece of metal at 100 C is transferred to a calorimeter containing 50.0 mL of water initially at 23.0 C. Calculate the specific heat capacity of the metal if the heat capacity of the calori
In the first 15.0 s of the reaction, 1.7×10-2 mol O2 is produced in a reaction vessel with a volume of 0.370L. What is the average rate of the reaction over this time interval?
Question: What is the rate of the following reaction (M/s) if the rate constant for the reaction is 0.800 L•mol-1•s-1 and the concentration of each reactant is 0.0553 M. (The units for the
Two substances, A and B, have identical enthalpies of vaporization. They boil at 164 degree celsius and 236 degree celsius, respectively. If the entropy of vaporization of A is 87.2 J/K, what is the
A reaction has a rate constant of 1.28×10-4 /s at 27 C and 0.232 /s at 27C and .231/ s 77 at C.? What is the activation barrier?
A hydrogen atom initially in the n=7 quantum state emits a photon having a wavelength of 2.16495E-6 m. What is the quantum number of the final state of the atom?
What are the principal causes for the differences in conductance's of isomolar solutions of KNO3, HNO3, Ca(NO3)2 and Al(NO3)3?
Assume that a 6 volt energy source is in a circuit that has a resistance of 10 ohms. Determine the current and power. Provide numerical values and units.
What is the vapor pressure at 25oC, of a solution containing 4.00 x 10^2 g of sucrose, C12H22O11, in 5.00 x 10^2 g of water?
A 1100 kg car is moving at a speed of 40.0 m/s. (a) What is kinetic energy of the car? (b) How much work is required to bring the car to rest? (c) Determine the stopping distance if the brakes suppl
A mixture of helium and neon weighing 5.50g occupies a volume of 6.80 L at 300 K and 1.00 atm. Calculate the composition of the mixture in mass percent.
A 2.56 g sample of anthracene, C14H10, was burned to heat an aluminum calorimeter (mass=948g). The calorimeter contained 1.5 L of water with an initial temp of 20.5 C and a final temperature of 34.
How much energy in kilojoules is released when 15.3 g of steam at 115.0 degree C is condensed to give liquid water at 750.0 degree C?
A 500 mL gas sample is collected over water at a pressure of 740 mmHg and 25 degrees Celsius. What is the volume of the dry gas at STP? (STP=1atm and 0 degrees celsius). (Vapor pressure of H2O at 25
The half-life for the first order conversion of cyclobutane to ethylene
How much heat is needed to convert 885 g of ice at -10°C to steam at 119°C? (The specific heats of ice, steam, and liquid are 2.03 J/g · °C, 1.99 J/g · °C, and 4.18 J/g
The activity of a radioisotope is 3000 counts per minute at one time and 2736 counts per minute 48 hours later. What is the half-life of the radiosiotope.
Create a 6-step procedure to make 100 mL of a 0.10 M solution of sodium chlorate, NaClO3. Also, Create a 7-step procedure you can use to determine those cation/anion pairs that produce precipitates.
A NASA satellite showed that in 2003 the ozone hole was much larger than it was in 2002. The 2003 hole measured 1.04 X 10 7 mi2 in diameter, while the diameter of the 2002 hole was 6.9 X 106 mi2. Calc
What is the change in the boiling point of a solution made by dissolving 14.7 g of C6 H12 O6 into 150.0 mL of water? The density of water is 1.00 g/mL and Kb = 0.512°C/m.
Calculate the molecular mass of PABA, a common sunscreen agent. When 8.32g of PABA is dissolved in 150.0g of chloroform, it boils at 62.62 C. The boiling point of pure chloroform is 61.2 C; the boi
The specific heat of ethylene glycol is 2.42 J/g-K. How many J of heat are needed to raise the temperature of 62.0 g of ethylene glycol from 13.1 degrees celsius to 40.5 degrees celsius?