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In an electrolysis cell similar to the one employed during lab, a student observed that his unknown metal anode lost 0.233 g while a total volume of 94.50 mL of H2 was being produced. The temperature in the laboratory was 25°C, and the barometric pressure was 740 mmHg. At 25°C, the vapor pressure of water is 23.8 mmHg. Calculate the equivalent mass, EM, of the unknown metal anode. The student was told the metal was oxidized to a 2+ oxidation state. What is the metal in the anode?
what is the empirical formula of a compound containing 16.6% by mass of silicon and 83.4% by mass of chlorine? if the molecular mass of the compound is 336g/mol what is the molecular formula.
A gaseous mixture containing 0.220 mol fraction of carbon tetrachloride (CCl4) and 0.780 mol fraction of dry air is initially at 75.0°C and 1117 mmHg
Compare the experimental mole ratio of NaHCO3 to NaCl with the theoretical mole ratio. Explain the difference. The experimental mole ratio is 1:1.
In which state is the average distance between molecules the greatest?, Explain the difference in densities at the two temps in terms of the kinetic molecular theory.
water skier is pulled by a net force of 180 N and has an acceleration of 2.4 m/s2. What is the mass of the skier?
A buffer is made by mixing HCN and KCN to give a solution whose pH is 9.49. If the KCN molarity is 0.20 M, what is the molarity of the HCN?
You have 500 mL of a 5.0 M solution of nitric acid HNO3 (63.01 g /?mol) dissolved in water. How many grams of nitrogen does the solution contain.
Calculate molarity?if one mole of sodium hydroxide was dissolved estimate the number of calories that would be produced. (ΔHsolnNaOH)
what is the minimum number of Kilo Joules needed to change 40 grams of water 100 C to steam at the same temperature and pressure?
What is the pH at the isoionic point? What is the pH at the isoelectric point? Explain the difference between your answers in (a) and (b), including specifically why one result is larger than the other.
Give the chemical equation for the reaction that occurs in (B) to reach equilibrium.
Draw four structures corresponding to dihedral angles of 0, 60, 120 and 180 degrees. Clearly indicate the best and worst in this set.
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