Other Chemistry Answers

What was the effect of the addition of FeCl3 to the sample solution in the dichromate titration? Explain

The precipitate was filtered, washed free of precipitating agent, dried, and weighed, and 0.4114 g was recovered. Calculate the percentage of Hg₂Cl₂ in the sample.

Find the total enthalpy for rection   

 2C (g) +   3H₂ (g)         C₂H₆ (g)

                Given the thermochemical equations.

           2C(g) + 2 O₂ (g)                   2CO₂ (g)                 ∆H = -786 kJ/mol

           3H₂ (g) +  O₂ (g)            3H₂O (l)                           ∆H = -858 kJ/mol

2CO₂ (g) + 3H₂O (l)           C₂H₆ (g) +  O₂ (g)            ∆H = +1560 kJ/mol  

Chalcopyrite (CuFeS2) is a principal mineral of copper. Calculate the number of

kilograms of Cu in 3.71 X 103kg of chalcopyrite.

Silver sulphide and hydrogen gas are combined to form silver solid and hydrogen

sulphide gas. 10.0 g of H2 and 125.0 g of Ag2S are used in reaction.

What quantity of Ag is produced ? 

. Calculate HCV and LCV of a fuel, whose composition by mass is as follows;

Carbon – 90%, Hydrogen – 90%, Sulphur – 90% and reminder being Ash

Show the solution in calculating the pH for the following data:

• Vol NaOH = 0.00, pH = 3.30
• Vol NaOH = 24.90, pH = 5.87
• Vol NaOH = 26.00, pH = 9.12

Given the following, find the number of moles:14.2g of Co2

A. 0.32

B. 0.32 mol CO2

C. 0.4 mol CO2

D. 1.00 mol CO2

When incomplete fuel combustion happens in automobiles, it produces carbon monoxide. How does catalysis work in getting rid of this toxic gas? 

_________ is used in expressing the rate law. 

a. activation energy

b. reactant concentration

c. collision theory

d. reaction time