Question

Given the chemical equations:

C(s) + 2H_2(g) → CH_4(g)
C(s) + 2Cl_2(g) → CCl_4(g)
H_2(g) + Cl_2(g) → 2HCl(g)

Which statement is true?

A) The first equation must be reversed, and the third equation must be doubled.
B) The second equation must be reversed, and the third equation must be halved.
C) The first equation must be doubled, and the third equation must be reversed.
D) The third equation must be reversed, and the second equation must be doubled.

Answer 1

None of the given statements (A, B, C, D) pertain precisely to the provided balanced chemical equations. To manipulate the chemical equations, context such as a target reaction or thermodynamic data is required. As written, each chemical equation is already balanced.

Step-by-step explanation:

The student's question involves determining the truth of certain statements about chemical equations and how they might need to be adjusted to balance a given reaction or to derive a particular target reaction from given reactions by reversing or scaling them. The three chemical equations given are:

• C(s) + 2H2(g) → CH4(g)
• C(s) + 2Cl2(g) → CCl4(g)
• H2(g) + Cl2(g) → 2HCl(g)

By evaluating the options given, we can determine that none of the options (A, B, C, D) provided directly correlate with the equations listed. Each equation, as it is written, is already balanced and does not require reversal or multiplication by coefficients to balance it. However, statements regarding reversing or scaling an equation relate to changes in thermodynamic properties such as enthalpy (ΔH) or to manipulating equations to derive a different target equation that represents a desired overall reaction from a series of step reactions. However, without additional context about a target reaction or thermodynamic considerations, these statements cannot be validated.