Use the following data to determine the molar heat of vaporization of chlorine.
A)34,700 J
B)21,900 J
C)317 J
D)712 J
E)9.99 kJ

Question

Use the following data to determine the molar heat of vaporization of chlorine. 
A)34,700 J 
B)21,900 J 
C)317 J 
D)712 J 
E)9.99 kJ

Quizplus · Accepted Answer

We can use the formula q = n∆Hvap to calculate the molar heat of vaporization of chlorine.
First, we need to determine the amount of heat absorbed by the chlorine:
q = (50.0 g) x (1 mol Cl2 / 70.91 g) x (43.0 kJ/mol) = 30,250 J
Next, we need to determine the number of moles of chlorine:
n = 50.0 g / 70.91 g/mol = 0.704 mol
Now we can plug in these values into the formula:
30,250 J = (0.704 mol) x ∆Hvap
∆Hvap = 30,250 J / 0.704 mol = 43,057 J/mol or 21.9 kJ/mol (rounded to 3 significant figures)
Therefore, the best choice is B.

Use the Following Data to Determine the Molar Heat of Vaporization