Physical Chemistry Answers

A 0.2025 g sample consisting of only BaCl₂

and KCl required 20.25 mL of 0.1200M AgNO₃ solution for the quantitative precipitation of chloride.Calculate the %Ba and %K in the sample

Calculate the % sodium in a 0.721 g detergent sample. 

Final yield is 0.320 g NaP₂O₄

The mean enthalphy of vaporization of water in the temperature range between 363.15k and 373.15k is 2.268jg^-1 .calculate the vapor pressure of water at 363.15k, its value at 373.15k is 76vmHg ?

A certain liquid has a normal boiling point of 338.15k. using Trouton's rule

1. estimate the vapor pressure at 325.15k 2.estimate the boiling point at a pressure of 0.267bar

How many grams of MnO4 are required to obtain 0.028 moles?

10 Using the bond enthalpies provided, calculate the heat of reaction, ΔH, for:

C2H4(g) + H2(g) → C2H6(g) 

Given the following table of bond enthalpies:

C — H

413 kJ

C = C

614 kJ

C —C

348 kJ

H — H

436 kJ

Fe + 3 HV1 > FeC1₂+ * H2

The e.m.f. of the following cell reaction is 0.6753 V at 25 ℃ and 0.6915 V at 0 ℃. Cd(s) | CdCl2.5H2O(saturated) || AgCl(s) | Ag(s) (i) Give the balance for the cell reaction (ii) Calculate the free energy G, enthalpy H and entropy S, change of the cell reaction at 25 ℃. 

At 25 °C the specific conductance of 0.01 mol dm-3 aqueous solution of acetic acid is 1.63x10-2 Sm-1 and the molar conductance of infinite dilution is 390.7x10-4 Sm2mol-1 . Calculate degree of dissociation and dissociation constant of acetic acid.