You are visiting another planet, and the aliens there find out that you are a bi

Question

You are visiting another planet, and the aliens there find out that you are a biochemist. They want you to determine change in enthalpy for the reaction shown below, but all they provide you are the following values for the standard molar enthalpies of formation: Delta Hf of compound X2Y(l) = -66.9 kcal/mol; Delta Hf of compound ZY(g) = -22.1 kcal/mol; and Delta Hf of compound XZYYX(l) = -107.4 kcal/mol. Given this information, what is Delta Hrxn in kcal/mol to the nearest tenths? Reaction: X2Y(l) + ZY(g) ---> XZYYX(l)

Explanation / Answer

X2Y(l) + ZY(g) ---> XZYYX(l) : Hrxn = ?

Hrxn = H0fproducts – H0freactants

Hrxn = [(H0fXZYYX(l) )]- [H0fCX2Y(l) )+ (H0fZY(g) )]

= [-107.4] - [(-66.9) + (-22.1)] kcal/mol

= -18.4 kcal/mol

Therefore Hrxn = -18.4 kcal/mol

    = -1452.28 kJ

Related Questions

Navigate

• Browse (All)
• Browse Y
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.