Multiple Choice
If 4.00 g of hydrogen gas (H_2) reacts completely with excess oxygen gas (O_2) to form water (H_2O), how many grams of water are produced? (Molar masses: H_2 = 2.02 g/mol, H_2O = 18.02 g/mol)
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3. Chemical Reactions
Stoichiometry
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If a chemical reaction starts with 20 g of reactants and proceeds to completion with no side reactions, what is the maximum mass of products that can be formed according to the law of conservation of mass?
A
0 g
B
40 g
C
20 g
D
10 g
Verified step by step guidance1
Recall the law of conservation of mass, which states that mass cannot be created or destroyed in a chemical reaction. This means the total mass of reactants must equal the total mass of products.
Identify the given information: the reaction starts with 20 g of reactants and proceeds to completion with no side reactions.
Since there are no side reactions and the reaction goes to completion, all the reactant mass is converted into product mass.
Apply the law of conservation of mass: mass of reactants = mass of products.
Therefore, the maximum mass of products formed is equal to the initial mass of reactants, which is 20 g.
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