Stoichiometry

How many moles are in 36.0 g of water (H₂O)?

The molar mass of water is 18.0 g/mol, so 36.0 g of water is equal to 2 moles.

What conversion factor would you use to go from grams → moles?

The conversion factor to use is the molar mass of the substance in grams per mole.

How many grams of CO₂ are produced when 2.5 moles of CO₂ are formed?

to find the mass of CO₂, multiply the number of moles (2.5) by its molar mass (44.0 g/mol), resulting in 110 grams.

How many grams of oxygen are needed to react with 10.0 g of hydrogen in
2H₂ + O₂ → 2H₂O?

To find the grams of oxygen needed, first determine the moles of hydrogen (10.0 g ÷ 2.0 g/mol = 5.0 moles). From the balanced equation, 1 mole of O₂ reacts with 2 moles of H₂, so 2.5 moles of O₂ are required, which is 80.0 grams.

How many grams of water are produced when 16.0 g of O₂ reacts completely?

To find the grams of water produced, first calculate the moles of O₂ (16.0 g ÷ 32.0 g/mol = 0.5 moles). From the balanced equation, 1 mole of O₂ produces 2 moles of H₂O, resulting in 1.0 mole of H₂O, which is 18.0 grams.

What is a limiting reactant?

A limiting reactant is the substance that runs out first in a reaction, limiting the amount of product that can be formed.

Whats a percent yield?

Percent yield is calculated as the ratio of the actual yield of product obtained to the theoretical yield.

In a reaction, if one reactant runs out first, what happens to the other reactant?

The other reactant will remain in excess and will not be fully consumed.

What is molar mass?

mollar mass is calculated by adding the atomic masses of all atoms in a molecule.

What does it mean to balance a chemical equation?

To balance a chemical equation means to have the number of atoms of each element is the same on both sides of the equation.

How many grams are in 2.0 moles of NaCl?

2.0 moles of NaCl equals 116.88 grams.

How many moles are in 22.0 g of CO₂?

There are 0.50 moles of CO₂ in 22.0 g.

Which substance is the product?

The substance formed from a chemical reaction, usually found on the right side of the equation.

Which substances are reactants?

the starting materials in a chemical reaction, typically found on the left side of the equation.

How many moles are in 18.0 g of H₂O?

there are 1.0 moles of H₂O in 18.0 g.

How many grams are in 1 mole of O₂?

The molar mass of O₂ is 32.0 g.

What is a mole?

A mole is 6.022 x 10²³ as atoms or molecules.

What is a chemical equation?

A chemical equation shows the reactants and products along with their quantities using chemical formulas.

True or False: Molar mass tells you how much 1 mole of a substance weighs.

True, it represents the weight in grams of one mole of a substance.

How many grams are in 1 mole of NaCl?

There are 58.44 grams in 1 mole of NaCl, which is the sum of the atomic masses of sodium (Na) and chlorine (Cl).