Question

Can, anyone make sure these answers are correct?

1. If 0.765g of an unknown gas is collected at 741 torr (corrected) and 95°C in a 245 ml container, calculate the molecular weight of this unknown gas? P=741 tona PV=ART -> ideal gas equation n=PU T=95C+243=368K BT mass of the gas = 0.7659 =a41tów 80.245€ R= 62-4L-fowl mol- 624kbar V=245 med 'x 36644 Moler mass of the gos= 0.7659 245L 6 +91-1 60079rmal 2. If in the experiment in Question 1, the mass of the gas (0.765g) included two drops of condensed liquid (mass of two drops = 0.070g), calculate the true molecular weight of the gas? tave wright of gas 600 765-00070) g = 0.6959. So true MW of the gas= 0.695g 62.969/mol 3. Calculate the percent error caused by not taking into account the two condensed drops. Remember: % Error = Mexperimental - Merve 1x 100 Mirue 1967- BR.9 X 100 E-86 0.007gimol lo Enrol 101 4. If liquid droplets were left condensed on the inside flask walls, will the experimental molecular weight be higher, lower, or no different than the actual molecular weight? The tobar molar mass will be higher because those liquit doophts that were lift condroid on the inside Hask walls will add to the actual massa, 5. If the flask is not dried prior to measuring the mass of the flask after it has been removed from the hot water bath, will the experimental molecular weight be higher, lower, or no different than the actual molecular weight? Il fall is not drud, the initial mas would be highw then actual, so mass difference of link to initial would be bear thin actual mass and this, molecular weight ealulated would be lower than actual value- 6. If the no-hole rubber stopper is not placed firmly in the flask when the one-hole rubber stopper is replaced by the no-hole rubber stopper (so that air enters the flask). will the experimental molecular weight be higher, lower, or no different than the true molecular weight? The inpegimental moleular weight would be lower becours pun gas is escaping and density of ain would be less than the gas, weight would be lower 7. If the mass of the gas is found by subtracting the mass of the flask plus stopper and moist air from the mass of the flask plus stopper and unknown gas, will the experimental molecular weight be higher, lower, or no different than the true molecular weight? Il themes of the gas o found by subtracting the mass of the fall plus stopper and moist ain from the mass of the should plus stoppy and on known gas, the weight would be lower and the molecular weight also be low than hal valu. Exp. 12.6

Answer 1

1) Answer 1 revised and is correct.

2) Answer 2 revised and is correct.

3) Answer 3 revised and is correct.

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