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How much helium gas would it take to ?ll a gas balloon with a volume of 1020 cm 3 when the temperature is 39.0? C and the atmospheric pressure is 724 mm Hg? Answer in units of mol.
Determine the partial pressure and total pressure of each gas in the vessel and process of reaction runs until eighty five of the Oxygen is used and the vessel get cooled to its starting or initial temperature.
Calculate the reaction quotient Qc and find out at which temperature and
How many grams of dry NH4Cl need to be added to 1.80L of a 0.400M solution of ammonia, NH3 , to prepare a buffer solution that has a pH of 8.90? Kb for ammonia is 1.8*10^-5.
Design a qualitative analysis scheme
Substitution and elimination reactions are competing reactions. Under what conditions can you ensure that substitution will predominate
A substance has a molar extinction coefficient of 2.4x104cm-1M-1 and an absorbance of 0.10 What is the concentration of this substance in a cuvette with a 1.0 cm path length.
A sample of 0.0020 mole of HCl is dissolved in water to make a2000-mL solution. Calculate the molarity of the HCl solution,the [H3O+], and the pH.
What mass of sucrose should be combined with 488 of water to make a solution with an osmotic pressure of 8.25 at 280.
why would the chemiluminescence be more pronounced than with the flask stoppered? Why is the chemiluminescence even more pronounced with the ferricyanide/hydrogen peroxide mixture?
Determine the mean and 90% confidence interval for the average fluoride concentration in this sample.
A sugar-water mixture contains 45.8 g of sugar and 108.5 g of water. What is the percent by mass of sugar and the percent by mass of water in the solution?
A beaker with 1.30×102 mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M .
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