Multiple Choice
According to the law of conservation of mass, if 32.0 g of oxygen gas reacts completely with methane (CH4) to produce carbon dioxide and water, what mass of methane is required for the reaction: CH4 + 2 O2 → CO2 + 2 H2O?
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2. Atoms & Elements
Law of Conservation of Mass
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Which of the following statements is true about what happens during a chemical reaction according to the Law of Conservation of Mass?
A
The total mass of the products is always greater than the mass of the reactants.
B
The total mass of the reactants is equal to the total mass of the products.
C
The mass of the reactants is always less than the mass of the products.
D
Mass can be created or destroyed during a chemical reaction.
Verified step by step guidance1
Understand the Law of Conservation of Mass, which states that mass cannot be created or destroyed in a chemical reaction.
Recognize that during a chemical reaction, atoms are rearranged but the total number of atoms remains the same.
Since atoms are neither created nor destroyed, the total mass of the reactants must be equal to the total mass of the products.
Evaluate the given statements by comparing them to the Law of Conservation of Mass: the total mass of products cannot be greater or less than the reactants, and mass cannot be created or destroyed.
Conclude that the true statement is: 'The total mass of the reactants is equal to the total mass of the products.'
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