Stoich Practice

Front

What is a mole ratio?

Back

A mole ratio is a ratio that shows the relative amounts of moles of reactants and products in a chemical reaction, derived from the coefficients in a balanced equation.

Front

How do you balance a chemical equation?

Back

To balance a chemical equation, adjust the coefficients of the reactants and products to ensure that the number of atoms of each element is the same on both sides of the equation.

Front

What is the coefficient for NO in the reaction N₂ + O₂ → _ NO?

Back

2

Front

If 3 moles of H₂ react with N₂, how many moles of N₂ are needed?

Back

2 moles of N₂ are needed.

Front

What mass of O₂ is required to burn 36.1 g of B₂H₆?

Back

124 g O₂ is required.

Front

In the reaction 2Na + S → Na₂S, how many moles of S react with 4.0 moles of Na?

Back

2 moles of S react.

Front

What is the significance of coefficients in a balanced equation?

Back

Coefficients indicate the number of moles of each substance involved in the reaction, which is essential for stoichiometric calculations.

Front

Define stoichiometry.

Back

Stoichiometry is the calculation of reactants and products in chemical reactions based on the conservation of mass and the mole concept.

Front

What is the mole concept?

Back

The mole concept is a method of quantifying substances in chemistry, where one mole is defined as 6.022 x 10²³ particles (atoms, molecules, etc.).

Front

How do you determine the number of moles from mass?

Back

To determine the number of moles from mass, use the formula: moles = mass (g) / molar mass (g/mol).