Chemistry Stoichiometry and Reactions

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Questions and Answers

What is the concentration of the dilute H2SO4 solution in mol/dm³?

0.5 mol/dm³

0.1 mol/dm³

0.0744 mol/dm³ (correct)

0.2 mol/dm³

If 3 moles of NaOH are diluted in 1000 cm³ of solution, what will the molarity be?

0.15 mol/dm³

0.2 mol/dm³ (correct)

0.1 mol/dm³

0.3 mol/dm³

What is the total volume of gases if the total moles of gases is 0.25?

6 dm³ (correct)

24 dm³

500 cm³

2 dm³

Which of the following represents the correct conversion from cm³ to dm³?

1000 cm³ = 1 dm³ Signup and view all the answers

What is the concentration of the concentrated H2SO4 provided?

6.2 mol/dm³ Signup and view all the answers

How many moles of NaOH are present in 1000 cm³ of solution with a concentration of 0.2 mol/dm³?

0.2 moles Signup and view all the answers

What would be the concentration of a solution if 0.0744 moles of solute are dissolved in 1 dm³ of solution?

0.0744 mol/dm³ Signup and view all the answers

Calculating with 3.72 x 10^-3 moles of H2SO4 in a certain volume, how would you determine its concentration?

Dividing moles by volume in dm³ Signup and view all the answers

What is the theoretical yield of a substance in the context provided?

209 g Signup and view all the answers

How many moles of O2 are represented in the content?

0.25 mol Signup and view all the answers

What is the purity percentage of Calcium in limestone as indicated?

88.7% Signup and view all the answers

What amount of actual yield of NH3 is presented?

80 dm Signup and view all the answers

What is the significance of the number 6.0218 mentioned in the content?

It is Avogadro's number, used to define the number of particles in a mole. Signup and view all the answers

What volume of gas at rtp is associated with 0.00417 mol of CaCO3?

22.9 dm³ Signup and view all the answers

Calculate the number of moles of CO2 given as 0.00417 mol, as reflecting the quantity produced.

0.417 mol Signup and view all the answers

What does the term 'actual yield' refer to in the context provided?

The amount of product actually obtained from a reaction. Signup and view all the answers

Which of the following correctly defines the term 'molecular formula'?

It indicates the actual number of each type of atom in a molecule. Signup and view all the answers

What is the calculated total volume of gases at rtp for Mg(NO3)2?

102 g Signup and view all the answers

What does a 20g theoretical yield indicate about a reaction?

It is the predicted amount of product that can be formed under ideal conditions. Signup and view all the answers

If the yield is stated as 100, what is the yield percentage given an actual yield of 80?

80% Signup and view all the answers

What is the relationship between the ratio of moles of gases and the volumes of those gases?

They follow the ideal gas law under specific conditions. Signup and view all the answers

What is the purpose of calculating the ratio between moles of gases?

To find the limiting reactant in a chemical reaction. Signup and view all the answers

What can be inferred if the ratio of actual yield to theoretical yield is low?

There may be significant losses or inefficiencies in the reaction. Signup and view all the answers

If the empirical formula of a substance is CH, what is its molecular formula if it consists of 2 empirical units?

C2H2 Signup and view all the answers

Study Notes

Stoichiometry Calculations

Percentage Yield: (Actual yield / Theoretical yield) x 100
Molecular Formula: (Empirical formula)n , where n = Mr / Er
Moles of a Gas at RTP: Volume (dm³) / 24
Moles of a substance from mass and molar mass: Mass (grams) / Molar mass (g/mol)
Ratio between gas moles and volumes is equal: Moles of gas A / Moles of gas B = Volume of gas A / Volume of gas B
Ideal Gas Law: (CV) before = (CV) after
Actual Yield: The amount of product obtained in a reaction.
Theoretical Yield: The maximum amount of product that can be produced in a reaction according to the balanced chemical equation.

Chemical Reactions and Equations

Balanced Equation: 2Mg + O₂ → 2MgO
Moles of Mg reacted = 0.5 mol
Moles of MgO formed = 0.5 mol
Calculating % Yield: (Actual Yield/Theoretical Yield) * 100%
Calculating volume of gases at RTP: (Moles of gas)*24 dm³

Titration Calculations

Calculating moles of NaOH: Conc (mol/dm³) x Volume (dm³)
Calculating moles of H₂SO₄: Conc (mol/dm³) x Volume (dm³)
Moles from dilution: Concentrations are related by equations such as CxV = CxV, where C is the concentration and V is the volume with the subscripts referring before and after the dilution
Calculating concentration of H₂SO₄: Moles / Volume

Other Calculations

Calculating moles of CaCO₃ (Using balanced equation & ideal gas Law)
Percentage purity: (mass of pure substance/ mass of impure substance)× 100%
Empirical & Molecular Formulas: Used for calculating formulae from experimental data
Calculations from Reactions involving gases: Stoichiometry is used to determine how much of substances reacts or is produced in chemical equations.

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Description

Test your understanding of stoichiometry, chemical reactions, and titration calculations. This quiz covers key concepts like percentage yield, molecular formulas, and the ideal gas law, providing a comprehensive overview of essential chemistry principles. Perfect for students looking to reinforce their knowledge in these areas.