Question

2 H2O2(aq)-> 2H20(l) + O2(g) ΔΗ -196 kJ/molrun The decompostion of H202(aq) is represented by the equation above. A student monitored the decomposition of a 1.0 L sample of H2O2aą) at a constant temperature

asked Mar 24, 2021 64.1k views

2 H2O2(aq)-> 2H20(l) + O2(g) ΔΗ -196 kJ/molrun The decompostion of H202(aq) is represented by the equation above. A student monitored the decomposition of a 1.0 L sample of H2O2aą) at a constant temperature of 300. K and recorded the concentration of H202 as a function of time. The results are given in the table below.

COL1 Time (s) 0 200. 400 600
COL2 H2O2 1 2.7 2.1 1.7 1.4

The O2(g) produced from the decomposition of the 1.0 L sample of H2O2(aq) is collected in a previously evacuated 10.0 L flask at 300. K. What is the approximate pressure in the flask after 400. s? (For estimation purposes, assume that 1.0 mole of gas in 1.0 L exerts a pressure of 24 atm at 300.K.) The answer is 1.2 atm