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Calculate the pH of 100. mL of 0.28 M NH3 before and after the addition of 4.5 g of NH4NO3, and account for the change. Assume that the volume remains constant. What is the pH before and after the addition of NH4NO3?
How much PV work is done (in kilojoules), if 90.0 g of ethylene and 125 g of HCl are allowed to react at atmospheric pressure and the volume change is -71.9 L?
What is the density of lead if a rectangular bar measuring 0.500 in height, 1.55 in width, and 25.00 in length has a mass of 220.9g.
exactly one mole of nitrogen gas confined within a cylinder by a piston is heated from 0degc to 873degc at 1.00 atm.a
The balloon rises to an altitude of 20,000 m, where atmospheric pressure is 55 mmHg and the temperature is 210 K. What is the volume of the balloon at 20,000m?
A compound composed of sulfur and fluorine is found to contain 25.24% by mass of sulfur. If the molar mass of the compound is 254.11 g/mol, what is its molecular formula?
A solution contains 10.90g of unknown compound dissolved in 50.0mL of water. (Assume a density of 1.00 g/mL for water.) The freezing point of the solution is -6.53C. What is the molecular formula of the compound
Calculate the PH of this solution.
A constant electric current flows for 3.75 h through two electrolytic cells connected in series. One contains a solution of AgNO3 and the second a solution of CuCl2. During this time 1.50 g of silver are deposited in the first cell.
Calculate the amount of acid that would be left in the water solution after four 20-mL extractions with ether. Do the same calculation, using one 80-mL extraction with ether, to determine which method is more efficient.
suppose the pressure inside a pressure cooker reaches 1.3 atm. By using the vapor-pressure table, estimate the temperature at which water will boil in this cooker
the reaction is spontaneous below a certain temperature. Calculate that temperature. values are for delta H and delta S respectively.
Fe2O3 + 3CO------2Fe + 3Co2 suppose that 1.14x 10^3kg of Fe is obtained from 1.82x 10^3 kg of samples Fe2O3. Assuming that the reaction goes to completion. What is % purity of Fe2O3 in orginal sample
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