Using the following thermochemical equation, determine the amount ...

[kellyjaisingh]

Using the following thermochemical equation, determine the amount of heat produced per kg of CO2 formed during the combustion of benzene (C6H6).
 
  2 C6H6(l) + 15 O2(g)  12 CO2(g) + 6 H2O(g) Hrxn = -6278 kJ
 
  A) 1.43  105 kJ/kg CO2
  B) 2.30  104 kJ/kg CO2
  C) 4.34  104 kJ/kg CO2
  D) 1.19  104 kJ/kg CO2
  E) 8.40  105 kJ/kg CO2

Question 2

According to the following reaction, how much energy is required to decompose 55.0 kg of Fe3O4? The molar mass of Fe3O4 is 231.55 g/mol.
 
  Fe3O4(s)  3 Fe(s) + 2 O2(g) Hrxn = +1118 kJ
 
  A) 1.10  106 kJ
  B) 2.38  102 kJ
  C) 2.66  105 kJ
  D) 1.12  103 kJ
  E) 3.44  104 kJ

Question 3

How many grams of CaCl2 are needed to prepare 125 mL of a 1.50 M solution?
 
  A) 0.188 g
  B) 1.69 g
  C) 3.00 g
  D) 20.8 g
  E) 37.0 g

[Silverbeard98]

Answer to Question 1

D

Answer to Question 2

C

Answer to Question 3

D

[kellyjaisingh]

Gracias!

[olderstudent]

Excellent