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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 16.48mmHg2Al(s) + 6 HCl(aq)---->2 AlCl3(aq) + 3H2(g)
At high temperature, ammonia reduces copper(II) oxide to the free metal: Step 1: 2NH3(g) + 6CuO(s) => N2(g) + 3Cu2O(s) + 3H2O(g) Step 2: 2NH3(g) + 3Cu2O(s) => N2(g) + 6Cu(s) + 3H2O(g)
What temperature would you expect seawater to freeze? You may assume that the density of sea water is 1kg/liter and Kf=1.86 for water
Estimate the mass of potassium hydrogen phthalate (KHP) that will require 25 ml of 0.10 M NaOH to reach the equivalence point in a titration.
The standard enthalpy change in the combustion of the hydrocarbon octane is delta H=-5.48*10^3KJ/Mol C8H18. How much heat, in kilojoules, is liberated per gallon of octane burned? Density of octane = 0.703 g/mL 1 Gal=3.785 L
In a gas mixture, the partial pressures are nitrogen 420 torr , oxygen 125 torr , and helium 245 torr. What is the total pressure (torr) exerted by the gas mixture?
At 20 degrees C, 0.164 mg of H2 dissolves in 100.0 g of water when the H2 pressure above the water is 1.000 atm. Find the Henry's law constant for H2 is water at 20 degrees C.
how many moles of hcl are required to react with 0.610 g of aloh3 in the above unbalanced reaction? use at least as
The decomposition of potassium chlorate (KClO3) is used as a source of oxygen in the laboratory. How much potassium chlorate is needed to produce 20.7 mol of oxygen?
Indicate for each carbon in the following molecules the hybridization, geometric shape, and bond angles: a) CH3CH3
An additional atm pressure of HI is admitted to the con- tainer, and it is allowed to come to equilib- rium again. What is the new partial pressure of HI?
The mixture was stirred, causing all of the sample to dissolve. The excess HCl in the solution required 38.4 mL of 0.164 M NaOH for complete neutralization in a titration. What was the molecular formula of the white substance
Provide a structure for the following compound: EI mass spectrum: two molecular ions of about equal intensity at m/z = 180 and 182; IR: 1740 cm-1; 1H NMR
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