Chemistry Answers

What products are produced by the electrolysis of an aqueous solution of iron (II) nitrate?

In the reaction N2+3H2>2NH3, what is the mole ratio of hydrogen to nitrogen

A 12.0 L balloon at 84 C is cooled until it becomes 5.0 L. To what temperature was the balloon cooled?

how many ml of soln are required to prepare 0.02 mol of 2.5m Nacl soln?

Write the steps in the complete ionization of the following polyprotic acids.

A. H2CO3

B. H3BO3

A certain concentration method works best when the analyte’s concentration is approximately 10 ppb.

a.) if method requires a sample of 0.5 mL, about what mass of analyte is being measured?

b.) if the analyte is present at 10% w/v, how would you prepare the sample for analysis?

c.) Repeat for the case where the analyte is present at 10% w/w.

d.) Based on your answers to part (a)-(c), comment on the method’s suitability for the determination of major analyte?

if 18.8 ml of 1.25 m sodium hydroxide solution is necessary to neutralize 25.0 ml of hydrochloric acid solution to a phenolphthalein end point, calculate the molarity of the hydrochloric acid solution

Predict whether the entropy change of the system in each of the following is positive or negative.1. O2(g) → 2O(g)2. N2 (g, 10 atm) → N2 (g, 1atm)3. 6CO2(g) + 6H2O(g) → C6H12O6(g) + 6O2(g)4. 2 H2 (g) + O2 (g) → 2 H2O (l)5. NH4Cl (s) → NH3(g) + HCl (g)

Given the reaction:

2 NaOH + H₂SO₄ ⟶

  Na₂SO₄ + 2 H₂O 

How many moles of sodium sulfate (Na₂SO₄) reproduced when 9.9 moles of sodium hydroxide (NaOH) are reacted with excess sulfuric acid?

4. A solution of HF contains 12 grams in 500.0mL. (5 marks)

a. Find [H+]. Make sure to show the ionization equation (with water)

. b. Calculate the pH of the above solution.

5. Predict the products of the following neutralization reactions (be sure to balance the equation and include states as well). (2 marks) a. HCl(aq) + Mg(OH)2(s)  b. H3PO4(aq) + KOH(s) 