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Calculate the number of chromium atoms in a 2.0 cm by 1.0 cm by 7.0 cm piece of this stainless steel. Calculate the number of 52Cr atoms in the above sample. The natural abundance of 52Cr is 83.789%
Calculate the mass of a sample of iron (in kilograms) which contains the same number of atoms as 0.8118 L of mercury metal (density of mercury is 13.534 g/cm3).
Given the balanced equation 2 O3(g) --> 3 O2(g) , determine the rate of reaction with respect to [O2]. If the rate of formation of O2 is 6.94*10^-1 M/s, what is the rate of reaction of O3
Rubidium has two stable isotopes, 85Rb and 87Rb. The 87Rb isotope has a natural abundance of 27.83% and an atomic mass of 86.909183 amu. Calculate the percent abundance and atomic mass of the 85Rb i
Determine how many grams of each of the following solutes would be needed to make 3.00 x 10^2of a 0.100 M solution.
A 1.28 g sample of calcium metal reacts with oxygen gas to form 1.79 g of solid calcium oxide as its only product. Using the law of conservation of mass, calculate the mass of oxygen gas which react
Describe, in detail, how you would separate a mixture of ammonium chloride, NaCl, and sand. Will you be using chemical methods. Explain.
Calculate the heat in joules when 89.19 g of ice at 100.0 K is turned into liquid water at 10.0 degrees Celsius.
The observed rotation of a solution of 1.2 g of a compound in 10 mL of water is -6.9 degrees. If the pathlength is 10 cm, what is the specific rotation of the compound
The specific rotation, [?]D, for (+)-tartaric acid is +12. What is the observed rotation for a solution of 0.75 g of (+)-tartaric acid in 10 mL of water in a sample tube having a pathlength of 10 cm
What is the percent-yield of H2 in the reaction below when an equimolar mixture of CH4 and CO2 with an initial total pressure of 20.0 atm reaches equilibrium at 1200. K, at which Kp = 3.548 x 106
A chilled carbonated beverage is opened and allowed to warm to room temperature. Will the pH change, and if so, how will it change. loss of CO2 from the beverage (Henry's Law) will result i
A sample of 40.0 ml of a .1 M acetic acid solution is titrated with .150 molar sodium hydroxide Ka for acetic acid is 1.8 x 10^-5. What is pH of solution at equivalence point
At 745K, the reaction 2AB(g) ? A2(g) + B2(g) has a Kc = 2.00 x 10-2. If a mixture of 1.00 mol AB and 1.00 mol A2 is sealed into a 10.0 L flask and heated to 745K, what will be the equilibrium concen
The solubility of benzoic acid at 0oC is 1.7g/L and at 90oC is 45.5g/L. How much water do you need to dissolve 0.455 g of benzoic acid at 90oC. How much of the original benzoic acid will remain in t
Complete and balance the following equation Write the ionic equation and net ionic equation. Indicate spectator ions and determine if a precipatie would form. (NH4)2C03(aq)+CaCl2
Phenolphthalein is added, and the solution remains colorless because of the excess acid that has not been neutralized. the solution is tirtared with 9.7 mL of 0.09 M NaOH to a faint pink endpoint
The burning of a piece of paper in air (to produce CO2 and H2O vapor) is a spontanous reaction exothermic reaction. What would be necessary to start this reaction
If the molarity of stomach acid is 0.1 M (assumed to be HCl), how many grams of stomach acid will be "consumed" (i.e; neutralized) per gram of the antacid Ca(OH)2. Assume the denisty of stomach acid
A beaker contains 250 mL of .0150 M silver ion. To this beaker is added 250 mL of .300 M bromide ion. What is the concentration of Ag+ in the final solution. Ksp for AgBr = 5.0 x 10^-13
How many grams of .49% wt% aqueous HF are required to provide a 25% excess to react with 25 mL of .023 M Th^4+ by the reaction Th^4+ + 4F^- --> ThF4
A certain second-order reaction ( B--> product) has a rate constant of 1.50×10?3 M-1*S-1 at 27C and an initial half-life of 214s. What is the concentration of the reactant B after one half-
What is the heat energy change for this in kcal. Specific heat of h2o 1.00cal/gC. How many mols of cacl2 is this. How much heat energy per mol. answer in kilocalories
Then 2.00 mL of solution containing 0.0156 M dopamine was mixed with 90.0 mL of unknown, and the mixture was diluted to 100.0 mL in volumetric flask. The signal from the new solution was 58.4 nA. Wh
A mixture containing 80.0 nM iodoacetone (designated A) and 64.0 nM p-dichlorobenzene (designated B) gave the relative detector response (peak area of A)/(peak area of B) = 0.71 in a chromatography