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On a certain winter day in Utah, the average atmospheric pressure is 738 torr. What is the molar density (in mol/L) of the air if the temperature is -18 degrees Celsius
Aluminum reacts with excess hydrocholoric acid to form aqueous aluminum chloride and 28.7 mL of hydrogen gas over water at 27C and 751 mmHg. How many grams of aluminum reacted
12.0 moles of gas are in a 7.00L tank at 25 degrees Celsius. Calculate the difference in pressure between methane and an ideal gas under these conditions. The van der Waals constants for methane are
A 50.0-mL sample of 0.100 M Ca(NO3)2 is mixed with 50.00 mL of 0.200 M NaF. When the system has come to equilibrium, which of the following sets of conditions will hold? The Ksp for CaF2 is 4.0 x 10
A 300.0-mL saturated solution of copper(II) peroidate (Cu(IO4)2) contains 0.44 grams of dissolved salt. Determine the Ksp.
Assuming that the smallest measurable wavelength in an experiment is 0.330 fm (femtometers), what is the maximum mass of an object traveling at 213 m·s-1 for which the de Broglie wavelength i
A certain rifle bullet has a mass of 5.49 g. Calculate the de Broglie wavelength of the bullet traveling at 1697 miles per hour.
How many milliliters of 0.100 M NaOH solution are required to neutralize a solution containing 3.92 g H2SO4
What pH will would measure for these solutions immediately? What would be the pH after the solutions equilibrate with the atmosphere
To determine the concentration of a 25.0 mL ammonia solution (Kb for NH3 is 1.8 x 10-5), 25.0 mL of 0.200 M HCl solution is used. Calculate the pH of the endpoint.
A 50.0 mL sample of constant-boiling HCl with a concentration of 0.1166 M was collected and titrated to an end point with 37.17 mL of Ba(OH)2 solution. What is the molarity of the Ba(OH)2 solution
An equilibrium mixture contains 0.810 mol HI, 0.170 mol I2, and 0.200 mol H2 in a 1.00-L flask. What is the equilibrium constant for the following reaction
Assuming that the atoms are spheres and the radius of each sphere is 1.23 Å, what is the volume of one atom in Å3? (Vsphere = 4/3?r3.)
A chemist places 1.7823 g of Na2SO4 in a 100 mL volumetric flask and adds water to the mark. She then pipets 10 mL of the resulting solution into a 50 mL volumetric flask and adds water to the mark
A sample of C2H2 contains 3.02 moles of C (12.0 g/mol). How many moles of C2H2 (26.04 g/mol) are present
How many grams of MgCl2 would be needed to prepare 2.000 L of a solution that is 197 ppm in Mg2+ ions. Note: there is one Mg2+ ion in every MgCl2.
How many moles of MgCl2 are needed to prepare 25 mL of a 1.49 M MgCl2 (aq) solution in a volumetric flask
If we made an aqueous solution from 7.7 g of C6H12O6 in a 250 mL volumetric flask, what would be the concentration of C6H12O6 in units of molarity
Barium peroxide decomposes when heated to give BaO and O2. Write the balanced equation for this reaction. How many moles of O2 is formed when 0.500 mole of BaO2 is decomposed
Based on the given chemical equation, how many grams of aluminum are needed to react with 0.6 moles of hydrochloric acid? Al + HCl yields AlCl3 + H2
Write the first step in this elimanation reaction, using curved arrows to show electron reorganization. OH- CH3-C-(CH3)2Cl
A sample of ammonium dichromate contains 2.25 moles of hydrogen atoms. How many moles of oxygen atoms are in the sample