None. One pound of fat is equivalent to 3,500 calories.
You can not gain any pounds just by drinking one can of soda. A can of Coca-Cola only has 140 calories per can. However, if you drink many soda's over a period of time and don't exercise the pounds can start adding up.
4.5g of baking soda would be roughly equivalent to 0.56 teaspoons or 0.19 tablespoons.
For one soda contains a very high amount of sugar, sugar can cause a high amount of weight gain. Second, soda is just about the most acidic drink you can buy. Third soda contains phosphorus which can leach calcium from your bones. It will dissolve your tooth enamel.
If you drink a 12 oz can of Coca-Cola every day you would gain 14.6 pounds per year. (one can = 140 calories x 365 days = 51,100 calories / 3500 calories = 14.6 pounds)
About a kilogram.
You couldn't pay enough to get one. Soda wasn't sold in cans until 1938.
To make two ounces of a mixture using coke and baking soda, you would need to decide on the desired ratio of the two ingredients. Once you have that, you can calculate the amounts needed. For example, if you wanted to use a 1:1 ratio, you would need one ounce of coke and one ounce of baking soda.
One could add baking soda to canned beans, but it is impossible to imagine why one would do so.
It'll have to gain one to have a stable octet.
That would all depend on the top three factors of: His desire to gain epic, his need to gain epic or the mental stability of the one they call epicleigh. It would also depend on the amount of epicness there is for one to gain. Or possibly since epicleigh is from the fountain of epic which all other epic things gain there epic from, hence the term "epicleigh" because in the language of epic "leigh" means "fountain of" and "epic" means "epic", so in the best case scenario, an epicleigh would not gain epic as he is already epic enough.
A teaspoon of baking soda made into a paste should be sufficient. Measure the baking soda first, then add the water.