General Chemistry Answers

A reaction takes place at a constant pressure of 1.10atm with an internal energy change of 71.5kj and a volume decrease of 13.6L. What is the enthalpy change for the reaction? (1L•atm = 101.325J)

In Europe, gasoline efficiency is measured in km/L

km/L. If your car's gas mileage is 39.0 mi/gal

mi/gal , how many liters of gasoline would you need to buy to complete a 142-km

km trip in Europe? Use the following conversions: 1km=0.6214mi

1km=0.6214mi and 1gal=3.78L

1gal=3.78L.

A titration was carried out to determine the concentration of a hydrogen peroxide solution. 5cm³ of the hydrogen peroxide solution was drawn off and diluted with water to 250cm³ solution in a volumetric flask. 25cm³ of this solution was pipetted into a conical flask and acidified. It was neutralised by 22.10cm³ of a potassium manganate(VII) solution of strength 0.0170 moldm^–3. Calculate the concentration of the original hydrogen peroxide solution (8 marks)

Which one of the following is not a description of oxidation process?

B.Loss of electrons

A.Gain of electrons

C.Gain of oxygen

D.Loss of hydrogen

Write the balanced ionic equation for the reaction of acidified H2O2 with MnO4- ions.