Chemistry Stoichiometry Knowledge Assessment

Front

What is the first step to solve a stoichiometry problem?

Back

Write a Balanced Equation.

Front

What is the mass of CO₂ produced when 35g of O₂ reacts in the equation CH₄ + 2O₂ → 2H₂O + CO₂?

Back

24.1 g.

Front

In the balanced reaction 3 Mg + 1 Fe₂O₃ → 3 MgO + 2 Fe, what is the ratio of moles of MgO to moles of Fe?

Back

3 mol MgO / 2 mol Fe.

Front

What can be placed to the left of a formula of a substance to balance an equation?

Back

Coefficient.

Front

What mass of O₂ is needed to burn 36.1 g of B₂H₆ in the reaction B₂H₆ + 3O₂ → 2 HBO₂ + 2 H₂O?

Back

125 g O₂.

Front

Define stoichiometry.

Back

The calculation of reactants and products in chemical reactions.

Front

What is a balanced equation?

Back

An equation where the number of atoms for each element is the same on both sides.

Front

What is the purpose of coefficients in a chemical equation?

Back

To indicate the number of moles of each substance involved in the reaction.

Front

How do you convert grams to moles?

Back

Use the formula: moles = mass (g) / molar mass (g/mol).

Front

What is the molar mass of O₂?

Back

32 g/mol.