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A 0.202 g sample of an Al?Ca alloy reacts with an excess of HCl(aq) to produce 0.0179 g H2(g). What is the mass percent of Ca in the alloy? The unbalanced equations are given below. (Hint: Let x = mass of Ca in the alloy in grams. Question 115 in your textbook is similar.)Al(s) + HCl(aq) ? AlCl3(aq) + H2(g) Ca(s) + HCl(aq) ? CaCl2(aq) + H2(g)
32P is a radioactive isotope with a half-life of 14.3 days. If you currently have 83.1 g of 32P, how much 32P was present 9.00 days ago
What is the predicted pH of the following: 0.1M HCl, 0.01M HCl, 0.001M HCl, 0.1M HC2H202, 0.1 M HC2H3O2, 0.1 M NH4Cl, deonized water
An aqueous solution of sodium hydroxide is labeled .010 M NaOH. What are the molar concentrations of NaOH, Na+ and OH- in the aqueous solution?
4 moles of nitrogen gas is placed inside a piston and cylinder device. The piston has a mass of 50 kg and an area of 0.05 m2. 100 kg of weights are placed on the piston. After coming to equilibrium the piston is locked into place.
To an open beaker containing 500ml of water at 298k, 20g of sodium metal is added. the reaction proceeds quite rigorously but ultimately comes to rest after consuming all of the sodium metal and thermally reequilibrating with the surroundings. The..
A voltaic cell is constructed that uses the following reaction and operates at 298 K. (Ered Ni+2 is -0.277) Zn(s) + Ni2+(aq) Zn2+(aq) + Ni(s) (a) What is the emf of this cell under standard conditions?
A solution is made by dissolving 5.00 g of iodine in 100 mL of methanol (density = 0.791 g/mL) to form a solution. What is the mass percent solute in the solution.
What is the maximum wavelength of light capable of removing an electron from a hydrogen atom in the energy states characterized
A solution contains an unknown mass of dissolved silver ions. when potassium chloride is add to the solution.,a white precipitate forms.
if 500g of potassium chlorate solid decomposes and produces 303g of potassium chloride solid, how many grams of oxygen gas are produced?
Determine What is the final concentration and calculate what is the Ksp of this salt at temperature of 25 degrees Celsius?
A mixture of heptane/decane at 1.8 bar, 120?C contains 80% by mol heptane. At what pressure should it be flashed to obtain a stream that is 90% rich in heptane? What are the composition of the liquid and the amounts of the two phases?
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