6. Chemical Quantities & Aqueous Reactions

How many milliliters of 0.325 M HCl are needed to react with 16.2 g of magnesium metal? 

2 HCl (aq) + Mg (s) → MgCl₂ + H₂ (g)

What is the molar concentration of a hydrobromic acid solution if it takes 34.12 mL of HBr to completely neutralize 82.56 mL of 0.156 M Ca(OH)­₂? 

2 HBr (aq) + Ca(OH)₂ (aq)  → CaBr₂ (aq) + 2 H₂O (l)

Consider the following balanced chemical equation: 

H₂O+ 2 MnO₄^– + 3 SO₃^2-  → 2 MnO₂ + 3 SO₄^2-+ 2 OH^–

How many grams of MnO₂ (MW:86.94 g/mol) will be created when 25.0 mL of 0.120 M MnO₄^– (MW:118.90 g/mol) reacts with 32.0 mL of 0.140 M SO₃^2- (MW:80.07 g/mol).  

Titration of a 20.0-ml sample of acid rain required 1.7 ml of 0.0811 m NaOH to reach the end point. If we assume that the acidity of the rain is due to the presence of sulfuric acid, what was the concentration of sulfuric acid in this sample of rain?"

The mass percent of CaCO₃(s) in the eggshell sample is closest to

a. What volume of a 0.150 M solution of KBr is needed to precipitate 16.0 g of AgBr from a solution containing 0.480 mol of AgNO3.

b. What volume of a 0.50 M solution of HCl would just neutralize 250 mL of a solution containing 5.5 g of Ba(OH)2?

Consider the following reagents shown below: zinc, copper, mercury (density 13.6 g/mL), silver nitrate solution, nitric acid solution.

a. Given a 500-mL Erlenmeyer flask and a balloon, how can you combine two or more of the reagents to initiate a chemical reaction that will inflate the balloon? Write a balanced chemical equation to represent this process.

b. What is the identity of the substance that inflates the balloon?

c. What is the theoretical yield of the substance that fills the balloon?