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The half-life of cobalt-60 is 5.20 yr. How many milligrams of a 1.000-mg sample remains after 3.50 years?
Can someone describe what the sn1 and sn2 mechanisms are and the primary factors that effect why alkyl halides undergo one pathway over the other.
1.70 atm of I2 and 1.30 atm of Br2 are loaded into an evacuated container. The following reaction takes place with Kp = 117.6 Calculate the equilibrium partial pressure of bromine gas. No approximat
What is the pH during the titration of 25.00mL of 0.10M NH3 (Kb = 1.8 x 10-5) after the addition of 10.00mL of 0.10M HCl titrant?
Dr. Brown has a radioisotope source containing 1.2 x 106 (also written as 1.2E+06) atoms of Plutonium-238 in 1985, how many atoms will remain in 352 years
Using the inverse square law of radiation, what Geiger counter reading would you get for a radioactive material when you are 3 feet from the source (assume an initial reading of 6300 R at a distance
Calculate the pH at the equivalence point in titrating 0.100M solutions of each of the following with 8.0×10-2 M NaOH.
Propanoic acid has Ka of 1.4x10^-5. If we make a solution 0.100M propanoic acid, what concentration of sodium propanoate should be added to give a buffer with a pH of 5.0?
it took 35.40mL of 0.100 M NaOH to titrate a 2.55 gram of a weak acid to the equivalence point. The pH when 17.7mL of the NaOH had been added was 6.2. What was the Ka for the acid
what is the free energy change (DG) when protons are pumped across the membrane from the side of the membrane with low concentration to the side with high proton concenration at body temperature (37
In a test tube, 10 mL of 0.100 M KI and 10 mL of 0.100 M Na2CO3 are mixed. Next, 0.10 M lead nitrate is added drop wise. What will be the concentration of CO3 2- when PbI2 first starts to precipitat
Sketch an approximate titration of an NaOH solution with standardized HCl solution. Briefly explain the shape of the curve before the equivalence point, at the equivalence point, and after the equiv
The solubility of AgCl (s) in water at 25 C is 1.33 *10^-5 mol/L and its DeltaH of solution is 65.7 Kj/mol. What is the solubility at 68.3 C?
A 0.3459 g tablet that contains bicarbonate generates 1.24 x 10?3 moles of CO2. What is the percent bicarbonate in the tablet? Bicarbonate is 61.0138 g/mol.
Estimate the value of the equilibrium constant at 640 K for each of the following reactions. DELTA Hf and S^o for BrCl (g) is 14.6 kj/mol and 240.0 J/mol*k , respectively. 2NO2(g) double arrows N2O4
A box of nails contains 90 straight nails and 10 nails too bent to be used. You randomly select 10 nails from the box. What is the probability that you removed 8 straight nails and 2 bent nails? To
The pH of 0.5 M formic acic, HCOOH, is 2.02. Calculate the difference in pH when 6.42 g of HCOONa is added to 390.9 mL of 0.50 M formic acid. Ignore any changes in volume.
When bicarbonate is reacted with acid it releases CO2. How many moles of HCO3? did you start with if you collect 1.24 x 10 3 moles of CO2(g)?
How many moles of gas are present when you collect 35.83 mL of the gas over water at 25.3?C and 0.97 atm?
A gas sample was collected over water at 25.3 degrees C. The total pressure is determined to be 0.97 atm. What is the partial pressure of the gas that was collected
If it takes 8.5 for the concentration of to decrease from 0.90 to 0.45 , how many hours are required for the concentration to decrease from 0.40 to 0.10
Pt(NH3)2cl2+h2o yields pt(NH3)2(H2o)cl+cl- has a rate that increases by a factor of 15 and a temeprature that inceases from 25 tp 50 degrees celsius what is the value of Ea?
The molecular weight of NADH is 663.43g ans it's absorbance coefficient is 6220 M^-1 cm^-1. How much of your solution do you have to dilute to obtain the desired concentration not exceeding volume o
Calculate the equilibrium partial pressure of bromine gas. No approximations can be made because the equilibrium constant is too large.
Calculate the expectation value for the potential energy of the H atom with the electron in the 1s orbital. Compare your result with the total energy