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A solution is 21.0% ethylene glycol (C2H6O2) solution in water with density of 1.02g/mL. WHat is the molarity?
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How many grams of sodium hydroxide are needed to react completely with 50.1 mL of 0.145 MCoCl2 solution? The net ionic equation for the reaction is Co2+(aq) + 2OH-(aq) Co(OH)2(s)
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A graduated cylinder contains 135 mL of water. A 18.0 g piece of iron (density = 7.86 \rm{g/cm^3}) and a 19.0 g piece of lead are added. What is the new water level in the cylinder?
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A mixture containing 3.9 moles of NO and 0.88 mole of CO2 was allowed to react in a flask at a certain temperature according to the equation given below. NO(g) + CO2(g) reverse reaction arrow NO2(g) + CO(g) At equilibrium, 0.11 mole of CO2 was present. Calculate the equilibrium constant Kc of...
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(NH4)2Cr2O7
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a balloon filled with 39.1 mol helium has a volume of 876 L at 0.0 degrees C and 1.00 atm pressure. the temperature of the balloon is increased to 38.0 degrees C as it expands to a volume of 998 L, the pressure remaining constant. calculate q, w, and change in enthalpy for the helium in the...
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How many moles of KMnO4 are present in 300 mL of a 5.00 x 10^-2 M solution?
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What minimum mass of succimer (in g) is needed to bind all of the lead in a patient's bloodstream? Assume that patient blood lead levels are 45 micro meters/dL , that total blood volume is 5.0L , and that one mole of succimer binds one mole of lead
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gh k
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What mass of is needed to precipitate the ions from 38.0 of 0.460 solution?
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Sample Questions
- 1. For organic chemistry, what is a concerted shift? How do things like acids or heat affect them? What other factors affect them?
- 2. Which of the following reactions is an acid-base neutralization reaction? Why are the rest of the answers incorrect?
- A. AgNo3 (aq) + NaI (aq) --> AgI (s) + NaNO3 (aq)
- B. S8(s) + 8O2 (g) --> 8SO2(g)
- C. Na3PO4 (s) + 2H2O (l) --> H2 (g) + 2NaOH (aq)
- D. Ca (OH)2 (aq) + 2HI (aq) --> CaI2(aq) + 2H2O (l)
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