Stoichiometry

What is the balanced equation for the reaction of ammonia and nitrogen monoxide?

• 4NH₃ + 6NO → 5N₂ + 6H₂O

• 2NH₃ + 3NO → N₂ + 3H₂O

• NH₃ + NO → N₂ + H₂O

• 3NH₃ + 2NO → N₂ + 3H₂O

What is Stoichiometry?

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

• Stoichiometry is the study of the properties of gases and their reactions.

• Stoichiometry refers to the measurement of the physical properties of substances.

• Stoichiometry is the analysis of the energy changes in chemical reactions.

How do you convert grams to moles?

• Multiply the mass of the substance by its molar mass.

• Add the mass of the substance to its molar mass.

• Divide the mass of the substance by its molar mass.

• Subtract the molar mass from the mass of the substance.

What is the molar mass of potassium bromide (KBr)?

• 100 g/mol

• 119 g/mol

• 130 g/mol

• 150 g/mol

What is the mass of O₂ needed to burn 36.1 g of B₂H₆?

• 100 g of O₂

• 110 g of O₂

• 124 g of O₂

• 150 g of O₂

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

• Use stoichiometry: convert moles of reactant to moles of product using the balanced equation, then convert moles of product to grams.

• Measure the volume of the reactants and apply the ideal gas law to find the product mass.

• Add the masses of all reactants together to find the product mass.

• Use the molar mass of the reactants to directly calculate the product mass.

What is the role of coefficients in a balanced chemical equation?

• Coefficients indicate the number of moles of each substance involved in the reaction, ensuring mass conservation.

• Coefficients represent the temperature at which the reaction occurs.

• Coefficients are used to balance the charge of the reactants and products.

• Coefficients determine the speed of the reaction.

What is the concept of limiting reactants in stoichiometry?

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

• The limiting reactant is the substance that is present in excess and does not affect the reaction rate.

• The limiting reactant is the substance that determines the temperature of the reaction.

• The limiting reactant is the substance that can be reused in multiple reactions.

What is the relationship between moles of reactants and products in a balanced equation?

• The coefficients in a balanced chemical equation represent the ratio of moles of reactants to moles of products.

• The number of moles of reactants is always greater than the number of moles of products.

• The moles of products are equal to the moles of reactants regardless of the coefficients.

• The coefficients indicate the total mass of reactants and products in the equation.

How many moles of Fe can be produced from 3 moles of Fe₂O₃?

• 4 moles of Fe

• 5 moles of Fe

• 6 moles of Fe

• 7 moles of Fe