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- Determine the boiling point of CS2, in °C, from the following data: CS2(g) CS2(l) ΔHf° / (kJ mol–1) 115.3 87.9 S° / (J mol–1 K–1) 237.8 151.0 Answer Options: 258 -14 116 78 432sig figCalculate the density of a mixture of methanol (CH3OH) and water at 20oC having acomposition of 40% w/w methanol (State your assumption(Density of water at 20oC = 998.2 kg/m3; Density of methanol at 20oC = 791.2 kg/m3)
- Calculate the following exercise with correct sig figs: ((2.9365mL - 3.00mL)/3.00mL)x100%Calculate the molar susceptibility of cyclohexane given that its volume susceptibility is −7.9 × 10−7 and its mass density is 811 kg m−3 at 25 °C.Q1a-> A sample of hydrogen (H₂) gas was collected over water at 60°C. If the total volume of gas collected was 53.9 mL and the atmospheric pressure was 1.14 bar, what mass (in g) of hydrogen gas was collected above the water? The vapour pressure of water at 60°C is 150 torr. Q1b=> What is the molar mass (in g mol-¹) of a gas which has a density of 1.91 g/L at a pressure of 0.91 bar and temperature 15.3°C? Your answer may not correspond to an actual gas. Do not try to identify the gas.
- P1B.11 A methane, CH4, molecule may be considered as spherical, with a radius of 0.38 nm. How many collisions does a single methane molecule make if 0.10 mol CH4(g) is held at 25 °C in a vessel of volume 1.0 dm3?P1A.5 Deduce the relation between the pressure and mass density, ρ, of a perfect gas of molar mass M. Confirm graphically, using the following data on methoxymethane (dimethyl ether) at 25 °C, that perfect behaviour is reached at low pressures and the molar mass of the gas. p/kPa 12.223 25.20 36.97 60.37 85.23 101.3 ρ/(kgm–3) 0.225 0.456 0.664 1.062. 1.468 1.734Show that the total number of degrees of freedom = 3N.
- The cohesive energy density, U, is defined as U/V, where U is the mean potential energy of attraction within the sample and V its volume. Show that U = 1/2N2∫V(R)dτ where N is the number density of the molecules and V(R) is their attractive potential energy and where the integration ranges from d to infinity and over all angles. Go on to show that the cohesive energy density of a uniform distribution of molecules that interact by a van der Waals attraction of the form −C6/R6 is equal to −(2π/3)(NA2/d3M2)ρ2C6, where ρ is the mass density of the solid sample and M is the molar mass of the molecules.Give 1 example of Gay Lussac's law application in real life and explanationEstimate the time needed for a glycine molecule to diffuse a distance of 27 μmμm in water at 20 ∘C∘C if its concentration varies over that distance from 1.16 mol/m3mol/m3 to 0.40 mol/m3?