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Determine the empirical formula using the following mass data. asample contains 15.136g of carbon, 1.762g of hydrogen, and 3.102 gof oxygen. please indicate which is the number of carbon atoms in th
The RMS speed for nitrogen molecules at 300K is 520m/s. What temperature would be required if the RMS speed of nitrogen molecules in 1500 m/s.
The average current flowing through the cell over the time period was 0.622A. The mass of thecopper anode before the electrolysis was 2.4852 g and 2.1335 gafterwards.
The solubility of sucrose (common table sugar) at 70 Celsiusis 320 g/100 g H2O. How much sucrose can dissolve in 200 g of water at 70Celsius?
An aqueous solution is prepared by dissolving 1.50g of hemocyanin,a protein obtained from crabs, in 0.250 L of water. The solution has an osmotic pressure of 0.00342 atm at 277K.
An argon ion laser puts out 5.0 W of continuous power at awavelength of 532 nm. The diameter fo the laser beam is 5.5 mm. If the laser is pointed toward a pinhole with a diameter of 1.2 mm,how many
Calculate the mass (in grams) of solid benzoic acid(C6H5COOH) you would need, in order toprepare 1.0 liter of benzoic acid/benzoate buffer of pH 4.00, usinga stock 0.050 M sodium benzoate(C6
Ethan C2H6 has a molar heat of vaporization of 15kj/mol. How many kilojoules or energy are required to vaporize 5g of ethane?
Calculate the heat evolved by burning one mole of a C20H40 if a 0.50 gram samplecauses the temperature of 2.50 Kg of water to rise3.46oC (water specific heat is 4.2J/goC)
If you want to change the buffer composition of aprotein solution via diafiltration, how many resevoir volumes are required to remove 99% of the original buffer components?
A solution made up of 150 g of benzene and 25.1 g of solute has afreezing point of -1.920C. Determine the approximate molar weight of the solute.
How many kilograms of methane gas must be discharged in a room with a volume of 306 cubic meters to reach the lower explosive limit of 5 volume percent?
A family heats their house with propane gas. The gas company reports that for an average home it takes 26.970 kJ of heat to raise the temperature of the air inside the house from 61.0oF to 70.0
What does the sign of the Standard Reduction Potential indicate? What does the magnitude of the Standard Reduction Potential indicate? What is the Standard Hydrogen Electrode (SHE) and what is itsEo
If certain car has a rated mileage of 30.0 miles per gallon,how many liters of carbon dioxide gas is generated when the car has been driven a distance of 16.0 miles?
The molar enthalpy of fusion (Delta H0) of ammonia is5.650 kJ/mol, and the molar entropy of fusion (Delta S0)of ammonia is 28.900 J/mol K. Using this information, calculate the freezing point of ammon
Consider the titration of 50.0mL of 0.217 M hydrazoic acid (HN3, Ka=2.6 x 10^-5) with 0.183 M NaOH. Calculate the pH of the solution after the addition of 29.7 mL of NaOH solution.
A glass electrode with an internal pH of 7.00 is dipped into asolution whose pH is 11.40. If the factor β is 0.98, how much voltage is generated by the pH gradient?
25 ml of 0.10 M acetic acid is titrated with 0.10 M NaOH. What is the pH at the equivalence point? Ka for acetic acid = 1.8× 10-5
Calculate the enthalpy change,ΔH, for this reaction per mole of X.Assume that the specific heat and density of the resulting solution are equal to that of water [4.18J/g.
Why do you have to calculate a mole fraction for the vapour? (whycan't you simply just say Pvapour=52+112....from thecalculations (.365/.95)134 + (.585/.95)(182)=P
An antique automobile bumper is to be chrome plated. The bumper, which is dipped into an acidicCr2O7-2 serves as a cathode of anelectrolytic cell.
When rinsing the walls of the E. flask during titrations with deionized water, why does it have no effect on the reported results of the titration performed?
Why do elements on the left hand side of the periodic table combinewith elements on the right hand side and what type of bondingis involved
Air is about 78% Nitrogen and 21% Oxygen molecules. Severalother gases make up the remaining 1%.What is the partial pressure of a)Nitrogen and b)Oxygen in airat atmospheric pressure.