Physical Chemistry Answers

Pressure is expressed as force /area,what represent it's SI units?

Calculate the work done when a gas expands its volume from 16 m^3 to 18 m^3 under 5 bar at 298K

What is not true about gases

. The reaction kinetics is governed by the equation V=kCA. The initial concentration is CA=1.5 M, k=0.75 1/s. Estimate the initial reaction rate. How many times the reaction rate diminishes by the moment of 2/3 of A-substance consumption?

9. A sol was obtained by mixing of 0.1 M Barium Nitrate and 0.1 M Potassium Chromate solutions. The micelles drift to anode in the electric field. What is the charge sign of the micelle? Write the reaction equation and micelle structure. The volume of which reagent was higher?

12. Estimate the solubility of CaCO3 in mole/l if its KS=3.8·10-9 M2.

13. The stability constant of the complex of {2-[5-(3-Chloro-4-methyl-phenylamino)-1,2,4-thiadiazole-3-yl]-1-methyl-ethyl}-(2,2,6,6-tetramethyl-piperidine-4-yl)-amine with β-cyclodextrin (β -CD) is β=540 M-1. Estimate the concentration of free substance X if its initial concentration is 0.01 M and CM-β -CD concentration is 0.2 M.

14. The combustion enthalpy of Cellobiose C12H22O11 is -5401.5 kJ/mole. Find the enthalpy of formation.

Estimate potential of the electrode NiCO3/ Ni,CO32- relatively to standard hydrogen electrode. E0NiCO3/ Ni,CO32- = 0.45 V, [CO32-]=0.01 M.

A reaction is catalyzed by an enzyme with parameters k=103 s-1, KM=61·10-6 M and concentration [E]0= 3.5·10-6 M. The initial concentration of the substrate is [S]0= 3.6·10-5 M. Estimate initial reaction rate. Find the substrate’s concentration providing 2-fold decreasing of the reaction rate.