Which of the following has a molar mass equal to 133? A) ...

[Chelseaamend]

Which of the following has a molar mass equal to 133?
 
  A) (NH4)3PO3
  B) Ca3(PO4)2
  C) Al2(SO3)3
  D) Co2(CO3)2

Question 2

Calculate a value for Erxn for a chemical reaction, if the reactants have an energy of +300 kJ/mol and the products have an energy of +100 kJ/mol. Is this reaction exothermic or endothermic?
 
  What will be an ideal response?

Question 3

Which one of the following reactions is NOT balanced?
 
  A) 2 CO + O2  2 CO2
  B) 2 SO2 + O2  2 SO3
  C) 2 KNO3 + 10 K  5 K2O + N2
  D) SF4 + 3 H2O  H2SO3 + 4 HF

Question 4

Which one of the following statements is NOT a correct statement of the Law of Conservation of Mass?
 
  A) The mass of a system is dependent upon chemical reactions that may occur.
  B) The mass of a system is conserved in a chemical reaction.
  C) Matter cannot be created or destroyed.
  D) Atoms are conserved in chemical reactions.

[yuyiding]

Answer to Question 1

A

Answer to Question 2

-200 kJ/mol. Reaction is exothermic.

Answer to Question 3

C

Answer to Question 4

A