Which equation is balanced?
A) N23H2 + H2 --> 2NH4
B) AgI + Na2s --> Ag2S + 2NaI
C) CH4 + Cl2 --> CCL4 + HCl
D) Fe2O3 + C --> Fe + CO2
Tell me why you're having a problem answering this question. To be balanced, you must have the same number of an element on each side of the equation. Just count. For example,
C) CH4 + Cl2 --> CCL4 + HCl
1 C on the left and 1 on the right. OK. 4 H on the left and 1 on the right. not balanced. 2 Cl on the left and 5 on the right. not balanced.
D) Fe2O3 + C --> Fe + CO2
2 Fe on the left and 1 on the right. not balanced. 3 O on the left and 2 on the right. not balanced. C is balanced.
To be balanced you must have EACH element the same on left and right. If any ONE element is not balanced then the entire equation is not balanced.
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To determine which equation is balanced, we need to check if the number of each type of atom is the same on both sides of the equation. Let's analyze each option:
A) N23H2 + H2 --> 2NH4
In this equation, we have an unbalanced number of nitrogen (N) atoms on the left side (23) but only 2 on the right side. Additionally, there are no hydrogen (H) atoms on the right side, while there are 2 on the left side. Therefore, this equation is NOT balanced.
B) AgI + Na2s --> Ag2S + 2NaI
In this equation, we have an equal number of silver (Ag) atoms on both sides (2). We also have an equal number of iodine (I) atoms on both sides (1). Additionally, sodium (Na) and sulfur (S) atoms are balanced, with 2 on both sides. Therefore, this equation IS balanced.
C) CH4 + Cl2 --> CCL4 + HCl
In this equation, we have an imbalance of carbon (C) atoms. We have one C on the left side but four C on the right side. Additionally, the number of chlorine (Cl) atoms is not balanced, as we have two on the left but four on the right. Therefore, this equation is NOT balanced.
D) Fe2O3 + C --> Fe + CO2
In this equation, we have an equal number of iron (Fe) atoms on both sides (2). We also have an equal number of carbon (C) atoms on both sides, with one on each side. Additionally, we have the same number of oxygen (O) atoms on both sides, with 3 on each side. Therefore, this equation IS balanced.
So, the balanced equation is option D) Fe2O3 + C --> Fe + CO2.