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Predict the mass of hydrogen gas produced when 2.73 g of aluminum reacts in a single replacement reaction with excess sulphuric acid.
2Al + 3H sub 2 SO sub 4, reaction arrow, 3H sub 2 + Al sub 2 (SO sub 4 ) sub 3.
Problem- A buffer solution is prepared by dissolving 2.17 mol of HCN (Ka = 4.0 x 10-10) and 3.86 mol of KCN in enough water to make 1.08 L of solution. What is the pH of this solution? Answer to 3 significant figures.
A metal forms the fluoride MF2. Electrolysis of the molten fluoride by a current of 3.86 A for 16.2 minutes deposits 1.07 (backwards "g") of the metal.
The solubility product of Mg (OH)2 is 1.2x10-11. Explain what minimum OH- concentration must be attained (for example, by adding NaOH) to make theMg2+ concentration in a solution of Mg(NO3)2 less than 1.0 x10-10M
nknown gas effuses in 11.0 min. An equal volume of H2 in the same apparatus under the same conditions effuses in 2.56 min. What is the molar mass of the unknown gas
Calculate the pH at 25°C of an aqueous solution that is 0.320 M in ethylamine and 0.140 M in ammonia (i.e.the solution contains both compounds).
estimating the thickness of a membrane by using bond distance.the carbon-carbon bond distance for single-bonded carbons
Explain if you dilute 28.0mL of the stock solution to a final volume of 0.600L, Explain what will be the concentration of the diluted solution
An electron is con?ned to a one-dimensional box of length L. It falls from the second energy level to the ground state, and releases a photon with a wavelength of 322 nm.
An impure sample of sodium carbonate, (Na2CO3) is allowed to react by dissolving it in an aqueous solution of 0.134 M HCl, according to the following reaction:
On the assumption that the debye-Huckel limiting law applies, what is the value of the solubility product equilibrium constant Ksp for AgCl in such conditions?
If 1.60 g A is allowed to decompose for 38 min, the mass of a remaining un-decomposed is found to be 0.40 g. Explain what is the Half Life t1/2 of this reaction
calculated using the energy level equation. A Li2+ ion emitted a photon with a wavelength of 11.4 nm to reach an energy level with n=1. What was the value of n for its initial energy level?
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