2. The half-life of Cloverium-131 is 8 days. How many grams of a 777g sample will remain after 40 days have passed?
0
8 days
16 days
24 days
32 days
40 days
(i have to fill out those days)

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)