Di-n-butyl phthalate, C6H4(COOC4H9)2(l), is an oily, unreactive liquid with a density of 1.046 g·mL–1 at 20°C. Calculate the height of a column of di-n-butyl phthalate that will be supported by a pressure of 2.00 Torr.   answer is 26.0mm

1) a) Sulfuric acid, the industrial chemical produced in the greatest quantity each year, is prepared by the reaction of sulfur in the presence of oxygen and water as described in the balanced chemical equation below. Calculate the volume, in ml, of 18.0 M sulfuric acid solution that can be prepared from the reaction of 1850 g of sulfur with 6.50x10'mL oxygen gas at 25°C and 0.965atm and plenty of water. 25(solid) + 302 (gas) + 2H20(liquid) _-→ 2H2SO4(aqueous) b. Which substance is the limiting reactant? Explain how you know.

(a) (c) A column of water in a buret is 336 mm Hg high. How high would that column be if it were mercury instead of water? (d) In order for the pressures to be equal, density and height of a column are inversely proportional, therefore the following relationship applies: (denHg)(hHg) = (denH20)(hH20) Note: the density of mercury is 13.6 g/mL and the density of water is 1.00 g/mL. An electrolysis experiment was run for 15 minutes and 45 seconds at an average current of 189 milliamps (mA). The mass lost by the copper anode was 0.0589 grams. (b) Calculate the number of coulombs transferred. (Remember: coulomb = amps x sec) Show full calculation of the height in mercury (remember to use proper significant figures.) Calculate the moles of copper lost from the anode. Based on the moles of copper lost determined in 1c, calculate the moles of electrons transferred. Remember, the reaction at the copper anode is: Cu(s)---> Cu¹² (aq) + 2 e

Potassium permanganate reacts with oxalic acid (H2C2O4) in aqueous sulfuric acid according to the following reaction:   2 KMnO4(aq) + 5 H2C2O4(aq) + 3 H2SO4(aq) 2 MnSO4·H2O(s) + K2SO4(aq) + 10 CO2(g) + 6 H2O(g)   What volume of 0.250 M KMnO4 solution is needed to react completely with 3.661 g of oxalic acid? (assume sulfuric acid is in excess)   Answer in mL with the correct number of significant figures; do not use scientific notation.