Heres the following data for the unknown formula?
mass of flask. boiling stone, and foil cap, g 82.657
water bath temperature, C 95.0
barometric pressure, in. Hg 30.09
volume of flask, ml 270
accepted molar mask of unknown, g mol-1 86.2
calculate mass of unknown, express bath water temperature in K, express baometric pressure in atmospheres, express volume of flask in L, calculate density of vaporized unknown, calculate molar mass of the vaporized unknown, calculate percent error in determination.
Answer:
m = 83.350-82.657 = 0.693g
T=95.0 C+273.16=368.2K
P = (30.09in)(25.4mm/in)(1atm/760m...
V=(270mL)(1L/1000mL)=0.270L
density = m/V=0.693/0.270=2.57g/L
MM=(density)RT/P = 2.57*0.08206*368.2/1.006= 77.1g/mol
error = (77.1-86.2)/86.2 * 100% = -10.5%
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