3.1.2 Amount of substance

Front

What is the Avogadro constant?

Back

The Avogadro constant (L) is 6.022 × 10²³ mol⁻¹, which is the number of atoms, molecules, or particles in one mole of a substance.

Front

How do you calculate the number of atoms in a given amount of substance in moles?

Back

Number of atoms = moles × Avogadro constant.

Front

What is the formula for calculating the density of a substance?

Back

Density (ρ) = mass (m) / volume (V).

Front

What is the relationship between moles, mass, and molar mass?

Back

Moles = mass (g) / molar mass (g/mol).

Front

What is the ideal gas law equation?

Back

PV = nRT, where P is pressure, V is volume, n is number of moles, R is the gas constant, and T is temperature.

Front

What is the molar volume of an ideal gas at standard temperature and pressure (STP)?

Back

The molar volume of an ideal gas at STP is 22.4 L.

Front

How do you convert grams to moles?

Back

Moles = grams / molar mass.

Front

What is the significance of the term 'stoichiometry' in chemistry?

Back

Stoichiometry is the calculation of reactants and products in chemical reactions based on the balanced equation.

Front

What is the formula for calculating the volume of a gas at different conditions?

Back

Using the combined gas law: (P1V1)/T1 = (P2V2)/T2.

Front

What is the definition of a limiting reactant?

Back

The limiting reactant is the substance that is completely consumed in a chemical reaction, limiting the amount of product formed.