So, let's calculate how many caffeine is there in one can:

2.77mg caffeine / 1oz

12oz / 1can

(2.77mg caffeine / 1oz) * (12oz / 1can) = 33.24mg caffeine per can.

If Lethal dose is 10.0g caffeine = 10,000mg caffeine

Then,

(10,000mg caffeine) * (1can / 33.24mg caffeine) = 300.84 cans.

You need approximately 301 cans to drink to die from soda.