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Question- 1. Rainwater collected contains Pb, Cu and Zn at 8.5, 5.0 and 7.5 micro ¬g/L. Determine these concentrations in units of mol/L (or nmol/L).
2. The concentration of ozone (O3) on a warm summer day (T = 33 °C, P = 1 atm) is 110 ppbv. What is the concentration in (a) mg/m3and (b) moles of O3per 106moles of air?
3. The mass of toluene (C7H8) in a 1 kg subsurface soil sample collected after an underground storage tank was removed was measured to be 5.5 mg. What is the concentration of toluene in the soil in (a) ppmmand (b) ppbm?
Please be very comprehensive in your answer and do not omit any steps
Question- Another metal phosphate is nickel phosphate. It will behave similar to calcium phosphate in an acid solution. What is the net ionic equation including phases for NiPO4(s) dissolving in H3O+(aq)
It was found that 19.33 mL of an HI solution are needed to react completely with 320 mL of a LiOH solution that has a pH of 11.87. What is the molarity of the HI solution
A pipette is used to add 46 mL of 0.3 M Pb(NO3)2 to a 273.0 mL solution of 0.3 M NaF. Determine the equilibrium concentration of Pb2+(aq) in the final solution. Ksp(PbF2)=3.6E-8
What is the change in internal energy (in J) of a system that absorbs 0.582 kJ of heat from its surroundings and has 0.267 kcal of work done on it
The boiling point of an aqueous solution is 101.53 °C. What is the freezing point? Constants can be found here.
Many odors from solvents, perfumes, and paint strippers are derived from aldehydes or ketones
A buffer is created by combining 140.0mL of 0.25 M HCHO2 with 70.0ml of 0.20M NaOH. Explain what is the pH?
barium hydroxide solution PH = 10.5 is needed. How many grams of Barium hydroxide are needed
The rate constant for the production of glucose from cellulose with a newly developed catalyst was found to vary with temperature as shown by the data in teh following table. What is the activation energy for this reaction
Suppose you have 42.50 mL of 0.998 M Lithium hydroxide and you pour that solution into 22.97 mL of 2.003 M sulfuric acid. What is the concentration of each ion in solution?
Using curved arrows to symbolize the flow of electrons, write the stepwise mechanism for the acid-catalyzed esterification of p-aminobenzoic acid to give ethyl p-aminobenzoate.
Describe and explain how each of the following experimental errors or variations might affect your results. a) you failed to dry the reaction flask after washing it with water.
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