General Chemistry Answers

Study the two-steps reaction below. 

Reaction 1: 

  Step 1 (slow): H2(g) + ICl(g)         HI(g) + HCl(g) 

  Step 2 (fast): HI(g) + ICl(g)       I2(g) + HCl(g) 

Reaction 2: 

  Step 1 (fast): NO(g) + NO(g)      N2O2(g) 

  Step 2 (slow): N2O2(g) + O2(g)         2NO2(g) 

 For each two-step reaction, answer the following: 

a.Write the overall reaction. What substance is the reaction intermediate? 

b.What is the rate law for the mechanism? 

c.What is the molecularity of the mechanism? 

Hydrogen Iodide (HI) gas decomposes into gaseous hydrogen and iodine following the second-order kinetics with a rate constant of 0.031/M.s at 400ºC. 

2HI(g)        H2(g) + I2(g) 

a.What is the half-life of the reaction if the initial concentration of HI is 0.045 M? Will the half-life be different if the initial concentration is 0.025 M? Justify your answer. 

b.How much HI (in M) remains after 5.0 Minutes if the reaction started with 0.024 M HI? 

c.How many minutes will it take for the concentration of HI to decrease from 0.045 M to 0.015 M? 

Element contains two isotopes,78x(19.5%) and 80x(80.5%).What is the relative atomic mass of element x? option ....(A) 78.5 (B)79.6 (C)80.4 (D)80.8

The decomposition of N2O5 follows first-order kinetics based on the reaction below. 

2N2O5(g)        O2(g) + 4NO2(g) 

The rate constant of the reaction at 25ºC is 3.46 x 10-5 /s. How long (in seconds) would it take for an initial concentration of 0.050 M to decrease to 0.015 M? What is the half-life of the reaction? 

240 mL of 0.32 M aluminum chloride reacts with excess silver nitrate in a double displacement reaction. What mass of silver chloride precipitate is produced?

AlCl3 + 3 AgNO3 -> Al(NO₃)₃ + 3 AgCl

Explain how to prepare 18.0 mL of 2.0 M HCl from 6.0 M HCI solution. (Hint: Calculate volume of 6.0 M HCI needed. Then explain how to make the solution from your volume of 6.0 M HCI and water.)

Aqueous hydrochloric acid HCl will react with solid sodium hydroxide NaOH to produce aqueous sodium chloride NaCl and liquid water H2O. Suppose 3.28 g of hydrochloric acid is mixed with 2.2 g of sodium hydroxide. Calculate the maximum mass of Sodium Chloride that could be produced by the chemical reaction. Round your answer to 2 significant digits.

7.23 × 1024 Al atoms =

how many milliliters of a 0.75 m solution of HNO3 are required to obtain 2.0 kg of NHO3

The heat of solution for silver nitrate is 22.59 kJ/mol. What does this value indicate?