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You find a .750L solution of triethylamine, but the bottle does not give ists concentration. If you measure the pH and find it to be 11.24, how many grams of triethylmine were used to make the solution?
a gas mixture consists of N2, O2, and Ne where the mole fraction of N2 is .55 and the mole fraction of Ne is .25. If the mixture is at STP in a 5.0 L container, how many molecules of O2 are present.
a coffee contains 100 mL of H2O. initial temperature of calorimeter is temperature 23 C.if 8.20 g of CaCl2 is added to calorimeter. what will be the final temperature of the solution in the calorimeter.
A gas occupying a volume of 263 mL at a pressure of 0.970 atm is allowed to expand at constant temperature until its pressure reaches 0.541 atm. What is its final volume?
How many grams of dry NH4Cl need to be added to 2.10 L of a 0.500 M solution of ammonia, to prepare a buffer solution that has a pH of 9.00? Kb for ammonia is 1.8*10^-5.
a balloon contains 0.76 mol N2, 0.18 mol O2, 0.031 mol He and 0.026mol H2 at 739 mmHg. what is the partial pressure of O2?
(a) Calculate the standard molar enthalpy change (deltaHrxn°) at 400 K (not 298 K) for the following reaction (the cyclotrimerization of ethyne to benzene)
if a container of nitrogen, oxygen, carbon dioxide has a pressure of 2.00atm and the partial pressure of O2 is 312torr,
The purpose of this experiment is to find out which fabric out of polyester, polypropylene, cotton and wool is the most suitable to make a sling back chair.
Calculate the molecular weight of this gas if A sample of gas weighs 0.250 g and occupies a volume of 112 cm3 at STP?
At 123?C, the pressure of a sample of nitrogen is 1.45 atm. What will the pressure be at 267?C, assuming constant volume?
Compute the density of dry air and molar mass at zero degree Celsius temperature and 1.0 atm of pressure.
A camera falls from a blimp that is 485 m above the ground and rising at a speed of 16.8 m/s. Find the maximum height reached by the camera with respect to the ground. The acceleration of gravity is 9.8 m/s2
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