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It depends a lot on factors of the cake, such as icing, layers, fillings, decorations (sprinkles, shaved chocolate, piping, ect.) and they type of cake (milk chocolate, baking chocolate, dark chocolate, ect.). Generally, a small slice of fairly simple and plain chocolate cake will be about 200 calories. A large slice can be about 400 calories. But a more complex cake can be up to 700 or 800 calories a slice.
There are about 20 grams in an average sized slice of chocolate cake. :D
That depends oh how big is the slice and how many are there but i think this site might be helpful: http://caloriecount.about.com/calories-stater-bros-double-chocolate-cake-i115093
about 260 calories per slice.
300-400
You can make a mint and chocolate slice or cake.
Chocolate cake is a food that players can make with a cooking level of 50, heals 150 life poins when consumed and yields 180 cooking experience for making a cake and 30 cooking experience for adding the chocolate. Each slice of chocolate cake heals 50 life points when consumed, which is 10 more than a plain cake. When one bite is taken out, it becomes a 2/3 chocolate cake. When two bites are eaten, it becomes a chocolate slice. Sources: http://runescape.wikia.com/wiki/Chocolate_cake
2 cups of pure cane sugar
That depends on the individual chocolate cake recipe.
Appetite
Usually, it's melted unsweetened baker's chocolate, mixed with semi-sweet chocolate wafers, and white chocolate wafers. Or with cocoa instead of unsweetened baker's chocolate. Or it's a 3 layer cake - layer per type of chocolate.
The average chocolate bar has 210 calories. The average slice of chocolate cake (commercially prepared, with frosting) has about 250 calories. Just remember: these numbers aren't exact, and the actual numbers can vary depending on the brand, recipe, etc.