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A 4.00 g sample of an aluminum-copperalloy reacts with excess hydrochloric acid. The 2.81 L of H2(g) produced is collected over water at a barometric pressure of 758.4 mmHg and 19°C. What is the mass percent of aluminum in the alloy?(aluminum reacts but copper does not react)
Note: The pressure of water vapour at 19°C is 16.48mmHg
2Al(s) + 6 HCl(aq)---->2 AlCl3(aq) + 3H2(g)
A mixture of 6.00 g He and 22.0 g Ne has a pressure of 530. mm Hg. What is the partial pressure of each of the gases?
sulfur dioxide is an unwelcome result of burning soft coal in power plants. Some of the sulfur dioxide ends up as sulfuric acid ( H2SO4) in acid rain.
Solutions of sodium carbonate and silver nitrate react to form solid silver carbonate and a solution of sodium nitrate. A solution containing 8.00 g of sodium carbonate is mixed with one containing 4.75 g of silver nitrate.
How many moles of NaOH should be added to a solution containing 0.440 moles of formic acid, HCOOH, to prepare a formic acid/formate
the following standard gibbs energy of formation values in kJ/mol: CH4, 50.7; H2O, -228.6; CO2, -394.4 calculate the standard free energy change for the combustion of CH4
How many grams of NaN3 are required to produce 11.0 ft3 of nitrogen gas if the gas has a density of 1.25 g/L?
The standardized perchloric acid solution is then used to titrate 41.10 mL of a solution of sodium lactate (NaC2H5OCOO). An endpoint is reached when 18.22 mL of perchloric acid has been added.
A beaker with 100 mL of an acetic acid buffer with a pH of 5.00 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 8.60 mL of a 0.380 HCl solution to the beaker. How much will the pH c..
Why are we being so careful to eliminate moisture from the reaction vessel, solvent, etc? What is the reaction that will occur if water is present?
The isotactic conformation of polypropylene is more regular than the syndiotactic conformation of polypropylene. C. Vinyl Polymers can exist as both Cis and trans isomers.
The lower flammability limit (LFL) for a gas is the minimum concentration of the gas, in air, below which there is too little fuel to support combustion; For propane, the LFL is 2.1 mol-%.
Calculate the concentrations of all species in a 1.62 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid are Ka1=1.4x10^-2 and Ka2=6.3x10^-8.
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