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Science Clinic => Chemistry => Topic started by: joe on Feb 15, 2020

Title: Which equation represents the reaction whose H, represents the standard enthalpy of formation of ...
Post by: joe on Feb 15, 2020

Question 1

The values of ΔH°f for the three states of benzene are approximately -22 kcal/mol, -11 kcal/mol, and Which is the value for solid benzene?
◦ 20 kcal/mol
◦ -11 kcal/mol
◦ -22 kcal/mol
◦ cannot be determined without additional information

Question 2

Which equation represents the reaction whose ΔH, represents the standard enthalpy of formation of CHCl3(l) at 25°C? (i.e., for which is ΔH = ΔH°f of CHCl3)
◦ C(s) + 1/2 H2(g) + 3/2 Cl2(g) → CHCl3(l)
◦ 2 C(s) + H2(g) + 3 Cl2(g) → 2 CHCl3(l)
◦ C(s) + H(g) + 3 Cl(g) → CHCl3(l)
◦ CHCl3(l) → C(s) + H(g) + 3 Cl(g)

Title: Which equation represents the reaction whose H, represents the standard enthalpy of formation of ...
Post by: meryzewe on Feb 15, 2020

Answer 1

-22 kcal/mol

Answer 2

C(s) + 1/2 H2(g) + 3/2 Cl2(g) → CHCl3(l)