Fill in the blanks below to determine the molecular weight of an unknown gas. Re

Question

Fill in the blanks below to determine the molecular weight of an unknown gas. Remember to always use correct signficant figures and units: international gas constant (R): 0.08206 L-atm/K-mol Data Table (1 point per blank) A. Lab pressure from the mercury manometer: 0.9562 atm ?. Temperature of the boiling water: 987°C-(1). 371.2 ? C. Volume of the round bottom flask: 1. Weight of the empty flask: 68.32 g 2. Weight of the flask filled with water: 313.33 g 3. Weight of water: (2) 24S,0 4. Presumed density of water: (3) 5. Volume of the flask: (4) D. Weight of gaseous hexane occupying known V at known P & T 1. Weight of empty flask: 68.320 g 2. Weight of flask filled with gas (after cooling): 68.590 g 3. Weight of gas: (5) Experimental Molecular Weight of Unknown (4 points) 1. E. Show Calculation Below: (answer without work shown receives no credit) Calculated Molecular Weight of Unknown: Assuming that the unknown gas was one of the following molecules, ba data which gas most likely represents your unknown (circle molecule)? 2. H-C-OH ?? methanol 1-propanol 2-but

Explanation / Answer

C. 4. The presumed density of water = 1 g/mL

5. According to ideal gas equation: PV = nRT

i.e. 0.9562 atm * V = (245.01 g/18 g mol-1) * 0.08206 L atm mol-1 K-1 * 371.85 K

i.e. The volume of the flask (V) = 434.37 2 L

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