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The LC50 is used in determining toxicity to aquatic species. It is the aqueous concentration of a test chemical that results in 50% mortality in the species during a predetermined time period. The LC50 measurde for fathead minnows, during a 96-h exposure test, is 151 mg/L for caffeine(C8H10N4O2) and 44.1 mg/L for TCE(C2Cl3H).
Is the LC50 exceeded if the aquaous concentration of caffeine is 6.2 X 10^-4 M and TCE is 4.5 X 10^-4 M?
In an experiment, 0.30 mol H2 and 0.30 mol I2 are mixed into a 1.00-l container, and the reaction forms HI. If Kc =49 . for this reaction, what is the equalibrium concentration of HI. I2(g) + H2(g) 2HI(g)
Which substance would be in top layer when each of the following pairs of solvents are added to the same container
What term expresses the ratio of moles of reactants and products according to the coefficients in the balanced chemical equation?
If the volumes in the buret and the flask are identical and the concentration of the acid in the buret is 0.250 M, what is the concentration of the base in the flask.
based on mole ratios. a sample is 59.53 c 5.38h 10.68n and 24.40o what is its empirical formula. a 0.2000 gram sample
Calculate the change in entropy (deltaS) when one mole of diamond is heated from a temperature of 0 K to 400 K at a constant pressure of 1 bar. The temperature-dependent heat capacity of diamond is Cv
A titration was performed with a solution of 10.00 mL of Ca(OH)2 and 25.00mL of DI water. The endpoint was reached with a 0.03192 M of HCl at a final volume of 11.25 mL.
If the volume of gasoline vapor and air at 1.00 atm of pressure is gradually decreased from 78.0 mL to 39.0 mL. What is the final pressure of ammonia if there is no chage in temperature
At the same temperature, rank the following substances in the order of increasing average kinetic energy: CO2, He, H2, CH4.
Determine the Boyle temperature for a gas with the equation of state: PVm=RT(1+(P/Pc)(Tc/T)*8/57*(1-4(T/Tc)^2)).
The following reaction is first order, C2H6---> 2CH3. If the rate constant is equal to 5.5x10^-4s^-1 at 1000K, how long will it take for 0.35 mol of C2H6 in a 1.00 L container to decrease to 0.20 mol in the same container
Using K=3.9 as the equilibrium constant, Keq, Compute the amount of Isoamyl acetate, also known as isopentyl acetate (C7H14O2 )that must be present at equilibrium.
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