11. You are a scientist studying the properties of an unknown substance. You made three distinct observations: 1.) Mass = 92.63 kg
2.) Volume = 12.173 cm
3.) Temperature = 101 °F
What is the mass in grams?
A. 926.3 grams
B. 9,263 grams
C. 92,630 grams
D. 926,300 grams
What is the density of the unknown substance?
A 760.9 g/cm
B. 7.609 g/cm
C. 14, 210 g/cm
D 1.421 g/cm3

)benzene and toluene form nearly ideal solutions. consider an equimolar solution of benzene and toluene. at 20 °c the vapour pressures of pure benzene and toluene are 9.9 kpa and 2.9 kpa, respectively. the solution is boiled by reducing the external pressure below the vapour pressure. calculate (i) the pressure when boiling begins, (ii) the composition of each component in the vapour, and (iii) the vapour pressure when only a few drops of liquid remain. assume that the rate of vaporization is low enough for the temperature to remain constant at 20 °c.