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The absorbance of a chlorophyll a standard solution in ethanol (density = 0.785 g/mL) is measured in a 1.3 cm cuvette or path length. The absorbance is 0.435 and the molar absorptivity coefficient is 86,300 M-1cm-1. The molecular weight for chlorophyll a is 893.49 g/mol.
A) What is the molar concentration of the solution?
B) What is the concentration of the solution in ppm?
How many ATOMS of xenon are present in 3.25 moles of xenon trioxide. How many MOLES of oxygen are present in 9.37E+22 molecules of xenon trioxide
n basic solution it gives ClO3- and ClO2- ions. 2ClO2(aq) + 2OH-(aq) ? ClO3-(aq) + ClO2- (aq) + H2O. To obtain the rate law for this reaction, the following experiments were run and, for each, the initial rate of the reaction of ClO2
What is the molarity of the HCl solution if 310mL of the HCl solution reacts with magnesium to produce 5.40L of H2 gas measured at STP
Draw a representation of the 3-D structure of the anion, including only the bonding-pair electrons, and any sulfur lone-pair electrons. What is the orientation of the oxygen atoms with respect to each other around the S-S bond?
Suppose that 1.41 g of impure barium hydroxide is dissolved in enough water to produce 177.1 mL of solution and that 44.1 mL of this solution is titrated to the stoichiometric point
A biochemical engineer isolates a bacterial gene fragment and dissolves a 19.6 mg sample of the material in enough water to make 37.9 mL of solution. The osmotic pressure of the solution is 0.340 torr at 25°C.
calculate the percent yield based upon the amount of maleic anhydride used. use the molecular weight of one repeating monomer unit for the weight of the product.
Either bulb will be used for 2,000 hours per year at an electricity cost of $0.14/kwh (kilowatt-hour). If the interest rate is 6%, which bulb is more cost effective over 8,000 hours of use based upon a comparision of Net Present Values?
Liquid octane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 9.1 g of octane is mixed with 22.7 g of oxygen.
a solid with an irregular shape and a mass of 11.33 g is added to a graduated cylinder filled with water
Container A holds 727 mL of ideal gas at 2.20 atm. Container B holds 134 mL of ideal gas at 4.20 atm. If the gases are allowed to mix together
Which of the following statements concerning the determination of crystal structure by x-ray diffraction is incorrect? X-rays are reflected from the repeating planes of an ordered crystal lattice
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