Diborane, B2H6, can be produced by the following reaction: 2 NaBH4 + I2 → B2H6 + 2 NaI + H2

When Abby reacts 86.4 grams of NaBH4 with 377 grams of I2, she produces 23.6 grams of B2H6. What is her percent yield?

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)