General Chemistry Answers

H2x + 2NaOH ------Na2x +2H2O

The total mass of the reactants was 228.2 g and 156.2 of salt was produced. Calculate the moles of water produced.

The percent composition of an unknown substance is 75.42% Carbon, 6.63% Hydrogen, 8.38% Nitrogen, and 9.57% Oxygen. If its molar mass is 334.0 g/mol what is its empirical and molecular formula

A compound with a molar mass of 544.0 g/mol is made up of 26.5 grams carbon, 2.94 grams Hydrogen and 70.6 grams Oxygen. What is its empirical and molecular formula?

Determine the empirical and molecular formula of a compound composed of 18.24 g Carbon, 0.51 g Hydrogen, and 16.91 g Fluorine has a molar mass 562.0 g/mol.

What titrant you would use to qualify calcium hydroxide. Write balance chemical equation for the reaction between titrant and calcium hydroxide

Determine the empirical and molecular formula given the percent compositions or masses.

8.81 g Carbon, 91.2 g Chlorine, Molar mass: 1362.5 g/mol

Determine the empirical and molecular formula given the percent compositions or masses.

20.2% Sodium, 37.6%Sulfur, 42.2% Oxygen, Molar mass: 682.8g/mol

Aqueous sulfuric acid H

2

SO

4

 reacts with solid sodium hydroxide NaOH

 to produce aqueous sodium sulfate Na

2

SO

4

 and liquid water H

2

O

. If 10.6

g

 of sodium sulfate is produced from the reaction of 8.8

g

 of sulfuric acid and 9.1

g

 of sodium hydroxide, calculate the percent yield of sodium sulfate. 

Round your answer to 2

 significant figures. 

Determine the empirical and molecular formula given the percent compositions or masses.

26% carbon, 3.3% Hydrogen, 70.3%Oxygen Molar mass=91.0g/mol

In the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation:

2CuS + 3O₂ → 2CuO + 2SO₂

Molar Masses:

• CuS (95.611 g/mol)
• O₂ (31.9988 g/mol)
• CuO (79.545 g/mol)
• SO₂ (64.0638 g/mol)

If 730 g of CuS and 379 g of O₂ are available, which reactant is limiting? What mass of CuO will be produced?

• Limiting reactant: Answer
  
• CuS
• O2
• Mass CuO: 
• Answer for part 1 and coordinate 2
  
•  g CuO

What mass of CuO can be formed from the reaction of 12.9 g of CuS and 83.4 g of O₂?

• Limiting reactant: Answer
  
• CuS
• O2
• Mass CuO: 
• Answer for part 2 and coordinate 2
  
•  g CuO