Multiple Choice
Which of the following is true regarding the atoms involved in a chemical reaction according to the Law of Conservation of Mass?
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2. Atoms & Elements
Law of Conservation of Mass
Multiple Choice
Which of the following chemical equations best supports the law of conservation of mass?
A
2H_2 + O_2 ightarrow 2H_2O
B
Na + Cl_2 ightarrow NaCl_2
C
N_2 + 3H_2 ightarrow 2NH_3 + H_2
D
C + O_2 ightarrow CO
Verified step by step guidance1
Step 1: Understand the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction. This means the number of atoms of each element must be the same on both sides of the equation.
Step 2: For each chemical equation, count the number of atoms of each element on the reactant side and compare it to the number on the product side.
Step 3: Check the equation \(2H_2 + O_2 \rightarrow 2H_2O\): On the left, there are 4 hydrogen atoms (from \$2H_2\() and 2 oxygen atoms (from \)O_2\(). On the right, there are 4 hydrogen atoms (from \)2H_2O\() and 2 oxygen atoms (from \)2H_2O$). The atoms balance.
Step 4: Examine the other equations similarly to see if the atoms balance. For example, \(Na + Cl_2 \rightarrow NaCl_2\) has 1 sodium atom on the left but 1 on the right, but chlorine atoms are 2 on the left and 2 on the right, so check if the formula \(NaCl_2\) is chemically correct and balanced.
Step 5: Identify the equation where the number of atoms for each element is equal on both sides, confirming it supports the law of conservation of mass.
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