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Experiment_2_Quiz - vacuum Also when you are trying to...

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Travis Collins Experiment 2 – Dissociation of a Propionic Acid Vapor Pre-Lab Quiz 1. Calculate P i (pressure with no dissociation) for 0.08g of propionic acid at STP (T=25 Cand V=3.4L). Molecular weight: 74.08 g/mol M= 0.08g, T=25 = 298.15K and V=3.4L, n D = 0.08 g * (1mol/74.08g) = .00108 mol Pi = n D RT/V = (0.00108mol)(0.082057 L·atm/K mol)(298.15K)/(3.4L) = .00777 atm 2. What is the purpose of valve A in the experimental setup? Valve A is the valve that vents to the room. We are going to have it closed most of the time during this experiment otherwise it would be dangerous. 3. Describe at least two hazards associated with improper use of valve E. If you tighten the metal valve too tight it will damage the valve and cause a leak in the
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Unformatted text preview: vacuum. Also when you are trying to obtain the residual pressure if you do not open the valve before it is significantly larger than 0.60 torr you could ruin the glassware. 4. How would you determine the uncertainty in delta H o from a graph of ln K p verses 1/T? (see page A-8) Because delta H o is defined by multiplying the gas constant times the negative slope of the graph we are going to have to use those values to determine the uncertainty. Since K p is related to pressures we would have to look at lowest increments that the capacitance manometer can read and the lowest increments the thermocouple can read....
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