What type of reaction is this 2 Mgl2 + Mn(SO3)2 -> 2 MgSO3 + Mnl4
O a. Synthesis or Combination
O b. Single Replacement (Displacement)
O c. Decomposition
O d. Combustion
O e.
Double Replacement (Displacement)

Given the following at 25c calculate delta hf for hcn (g) at 25c. 2nh3 (g) +3o2 (g) + 2ch4 (g) > 2hcn (g) + 6h2o (g) delta h rxn= -870.8 kj. delta hf=-80.3 kj/mol for nh3 (g), -74.6 kj/mol for ch4, and -241.8 kj/mol for h2o (g)