Stoichiometry Review Regents

Front

What is stoichiometry?

Back

Stoichiometry is the branch of chemistry that deals with the calculation of reactants and products in chemical reactions based on the conservation of mass.

Front

How do you convert moles to molecules?

Back

To convert moles to molecules, multiply the number of moles by Avogadro's number (6.022 x 10^23 molecules/mol).

Front

What is the formula to calculate the percent of water lost in a hydrate?

Back

% of water lost = [(mass of hydrate - mass of anhydrous salt) / mass of hydrate] x 100.

Front

What is the gram molecular mass of a compound?

Back

The gram molecular mass is the mass of one mole of a substance, expressed in grams, calculated by summing the atomic masses of all atoms in its molecular formula.

Front

How do you calculate the mass of a substance from moles?

Back

Mass (g) = Moles x Molar Mass (g/mol).

Front

What is the significance of Avogadro's number in stoichiometry?

Back

Avogadro's number allows chemists to convert between moles and molecules, providing a bridge between the macroscopic and microscopic worlds.

Front

What is the relationship between moles and mass in a chemical reaction?

Back

In a chemical reaction, the number of moles of reactants and products can be used to determine the mass of each component based on their molar masses.

Front

How do you determine the limiting reactant in a chemical reaction?

Back

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

Front

What is the molar mass of C8H18 (octane)?

Back

The molar mass of C8H18 is approximately 114 g/mol.

Front

How do you calculate the mass of a product formed in a reaction?

Back

Use the stoichiometric coefficients from the balanced equation to relate the moles of reactants to the moles of products, then convert to mass.