(Use this data for thenext set of questions. A 125 mL Erlenmeyer, flask has a me

Question

(Use this data for thenext set of questions. A 125 mL Erlenmeyer, flask has a measuredvolume of 152 mL. A 0.199-g sample of an unknown vaporoccupies the flask at 98.7 oC and 754 torr.Assume ideal gasbehavior. How many moles of vaporare present? what is the molecular weight of the molecules invapor? can someone pleaseanswer it? thank you. (Use this data for thenext set of questions. A 125 mL Erlenmeyer, flask has a measuredvolume of 152 mL. A 0.199-g sample of an unknown vaporoccupies the flask at 98.7 oC and 754 torr.Assume ideal gasbehavior. How many moles of vaporare present? what is the molecular weight of the molecules invapor? can someone pleaseanswer it? thank you.

Explanation / Answer

n = PV/RT = (745 torr *1atm/760 atm)*(0.152 L)/(0.0821 L-atm/mol-K* [98.7+273]K) n = 0.00488259329 moles n = 4.88e-3 moles molecular weight = 0.199 g / 4.88e-3 mol = 40.8 g/mol

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