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Consider the three flasks in the diagram below. Assume the temperature is held constant. When the stopcocks are closed, the three flasks have the following volume and pressure values: He 1.00 L at 200. torr, Ne 1.00 L at 410 torr, Ar 2.00 L at 250 torr. Assuming the connecting tubes have negligible volume, what is the partial pressure of each gas and the total pressure after all the stopcocks are opened?
Calculate the mass in grams of calcium bromide the chemist has added to the flask. Round your answer to 3 significant digits.
what can we conclude about the energy required to excite an electron from n=5 to n=6 versus the energy required to excite an electron from n=4 to 5.
An evaluation of R was performed, following the procedure described in this module. The barometric pressure was 736 torr, the temperature was 295 K, and the volume of hydrogen gas collected was 35.6 mL. The calculated value of R was 82.1mL atm K-1..
A 325-mL sample of solution contains 25.3 g of CaCl2 calculate the molar concentration of Cl in this solution
A 7.50 g piece of iron at 100 C is dropped into 25.0g of water at 22.0 C. Assuming that the heat is lost by the iron equals the heat gained by the water, determine the final temperature of the iron/water system. Assume a heat capacity of water 4.1..
The rate constant for a certain chemical reaction is. 0.0125 L mol^-1 s^-1 at 25 degree Celsius and 0.0125 L mol^-1 s^-1 at 50.0 Celsius. What is the activation energy for the reaction, expressed in kJ mol^-1
A urine sample was found to have a pH of 5.83. What would be the ratio of the unprotonated form, A, to the protonated form, HA, for uric acid in this urine sample?
Choose the answer in which the two atoms are listed in order of increasing ionization energy (smallest ionization energy listed first).
Suppose the energy level of an electron with quantum number n was proportional to n instead of 1/n^2, E= -2.18 x 10^-19 J
How many milliliters of 0.150M sulfuric acid are required to react with 8.20g of sodium bicarbonate.
Calculate (a) the work done when the gas expands isothermally against a constant external pressure of 200 Torr until its volume has increased by 3.6 dm3, and (b) the work that would be done if the same expansion had occurred reversibly.
For each pair of substances below, which one will have the higher molar entropy. Justify each choice with a brief explanation. Which substance has greater molar entropy. Why is its entropy greater
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