Question

the heat of reaction (qₓₙ) is determined to be +6,760 j when 0.255 mol of solute dissolves. what is the heat of solution (qₛₒₗₙ) for this substance? +6.76 j -6,760 j +6,760 j -6.76 j

Explanation:

Step1: Understand the relationship between \( q_{rxn} \) and \( q_{soln} \)

When a solute dissolves, the heat of the reaction (\( q_{rxn} \)) and the heat of the solution (\( q_{soln} \)) are related by the equation \( q_{soln} = -q_{rxn} \). This is because the heat released or absorbed by the reaction is opposite to the heat absorbed or released by the solution.

Step2: Calculate \( q_{soln} \)

Given \( q_{rxn} = +6760 \, \text{J} \), we use the relationship \( q_{soln} = -q_{rxn} \).
Substituting the value of \( q_{rxn} \) into the equation, we get \( q_{soln} = -6760 \, \text{J} \).

Answer:

-6,760 J