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A gas mixture contains 10.0 mol of CO and 12.5 mol of O2.
a) Compute the mole fraction of CO in the mixture.
b) The mixture is heated and the CO starts to react with O2 to give CO2 according to the equation: CO(g)+1/2O2->CO2. At equilibrium, 3.0 mol of CO2 is present. Using an ICE table, determine the mole fraction of CO in the new mixture.
Methyl red (Ka = 7.9 x 10^-6 is added to a buffered solution of unknown pH. Spectrophotometric measurements show the ratio of the basic to the acidic form of the indicator to be 2.57 to 1.000. Calculate the pH of the buffer solution.
A student measures the volume of water delivered by a 1 mL volumetric pipette several times and records measurements of 1.00, 0.97, 1.03, 1.01 and 1.03 mL. What is the average of the five measurements. Report your answer to 5 significant figures a..
Who does the first ionizaiton energy of the alkali metal in a given period compare with the first ionization energy of the halogen in the same period. What is the result in terms of how these elements tend to react with each other
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what advantage does using the Wiley extractor have over simply pouring acetone over the meat again and again?
the three naturally occurring isotopic forms of k are 39k 38.963707u 40k 39.363999 u and 41k. the percentage natural
The rate constant for a certain reaction is k = 5.80×10?3s^-1 . If the initial reactant concentration was 0.950 M , what will the concentration be after 3.00 minutes
The molar mass of an unknown salt is 75.6. If 2.29 g is added to 71.2 mL of water the temperature changes from 20.70oC to 21.39oC. What is the molar heat of solution (J/mol) of the salt?
A 25.0 mL sample of 0.400 M NH3(aq) is titrated with 0.400 M HCl(aq). What is the pH at the equivalence point. (Kb of NH3 = 1.8 ´ 10-5)
How many grams of hydrogen are collected in a reaction where 1.92 L of hydrogen gas is collected over water at a temperature of 40C and a total pressure of 738 torr.
a compound is 40.0 c 6.70 h and 53.3 o by mass. assume that we have a 100 g sample of this compound. the molecular
The temperature of the calorimeter increases by 82.9oC (Celsius). Given that the energy of combustion (?E) for lauric is -37.1 kJ/g, calculate the heat capacity of the bomb calorimeter. Make sure you enter kJ/C for your unit behind the number.
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