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A gas of unknown molecular mass was allowed to effuse through a small opening under constant-pressure conditions. It required 62 s for 1.0 L of the gas to effuse. Under identical experimental conditions it required 33 s for 1.0 L of O2 gas to effuse. Calculate the molar mass of the unknown gas. (Remember that the faster the rate of effusion, the shorter the time required for effusion of 1.0 L; that is, rate and time are inversely proportional.)
Compute the ratio of the concentration of H 2 CO 3 to that of the HCO 3- if The pH of a bicarbonate-carbonic acid buffer is 8.50
There are two stereoisomeric 1,3-cyclobutane carboxylic acids. one can form a cyclic anhydride, the other can not. draw the structures of theses compounds and indicate which one can be converted to a cyclic anhydride. explain
How many milliliters of 0.270 M Na2S2O2 solution are needed to titrate 2.303 of I2 according to the equation below
what is the theoretical yield for the equation
The initial pH. the volume of added base required to reach the equivalence point the pH at 12.0 mL of added base
Calculate change in heat when 18.80 g of water vapor steam at 100 C condenses to liquid water and then cools to 20.5. the molar heat capacity of water is 75.3 J/ (mol x C). Delta Hvap= 40.67 KJ/mol.
What is the mole fraction of ethanol, CH3CH2OH, in an aqueous solution that is 20.0% ethanol by mass? 0.150
You have 493 mL of chlorine trifluoride gas at 699mmHg and 45 degrees Celsius. What is the mass (in grams) of the sample.
An excited hydrogen atom emits a photon with a frequency of 1.141 x 10^14 Hz to reach the n = 4 state. From what state did the electron
calculate the smallest increment of energy that an object can absorb from yellow light whose wave length is
Consider the reaction, 2 D(g) + 3 E(g) + F(g) => 2 G(g) + H(g) When [F] is decreasing at 0.60 mol/Ls, how quickly is [G] increasing
Hydrobromic acid reacts with potassium carbonate to form potassium bromide,carbon dioxide , and water. Barney the incompetent lab tech accidently knocked a flask containing 255ml of 0.500 M hydrobromic acid onto the floor, and now he has to clean ..
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