The catalytic decomposition of hydrogen peroxide yields oxygen gas and water, according to the reaction given below. In an experiment, the decomposition of hydrogen peroxide yielded 75.3 mL of gas collected over water at 25°C and 0.976 atm. (Pwater = 0.032 atm at 25°C) 2 H2O2(aq) → 2 H2O(l) + O2(g) If the original H2O2 solution had a volume on 500 mL, what was the molar concentration of hydrogen peroxide prior to decomposition?                          A)    1.8 * 10-4 M                                B)    0.058 M                        C)    0.0062 M                        D)    0.060 M                        E)    0.012 M

For the following reaction: C3H8(g) + 3CO₂(g) + 4H₂O(1) 502(g) The change in gaseous moles, An = To maximize the product yield, the volume of the container should ◆ , so that the pressure will be (> →

Consider the reaction: 4 PH3 (g) →  P4 (g)  +  6 H2 (g) In the reaction above, 0.075 mole of H2 is produced in a 2.0-L container over some time period. What concentration of PH3 is consumed over the same time period?

#15

A student experimentally determines the gas law constant, R, by reacting a small piece of magnesium with excess hydrochloric acid and then collecting the hydrogen gas over water in a eudiometer. Based L-atm on experimentally collected data, the student calculates R to equal 0.0832 mol·K L-atm Ideal gas law constant from literature: 0.08206 mol·K (a) Determine the percent error for the student's R-value. Percent error = % (b) For the statements below, identify the possible source(s) of error for this student's trial. The student notices a large air bubble in the eudiometer after collecting the hydrogen gas, but does not dislodge it. The student does not clean the zinc metal with sand paper. The student does not equilibrate the water levels within the eudiometer and the beaker at the end of the reaction. The water level in the eudiometer is 1-inch above the water level in the beaker. The student uses the barometric pressure for the lab to calculate R.

(1) - The temperature is 21.3° C, atmospheric pressure is 755 mmHg and the volume of the gas bag is 981 mL. Convert each of these measurements to a set of units needed in the Ideal Gas law. Show all work! i) ii) temperature: pressure: volume:

8. In one lab this semester, you ran the reaction: KC1O3 (s) → KCl (s) + O2 (g). The directions asked you to add about 1.5 g KC1O3 to a crucible. How many liters of O2 should form at STP?