Problem 3-127

Coke is an impure form of carbon
When you have 100 g of coke, you actually have 95 g of carbon.
The remaining 5 g are by-products which not react.

Therefore, if you need 333 g of carbon to perform a reaction, you need to work "backward" to find the mass of coke required:

333 g carbon ×	100 g coke	= 351 g coke
	95 g carbon

Note:
1 tonne (metric) = 1000 kg = 1×10⁶g.
1 ton (imperial) = 2000 pounds
1 kg = 2.02046 pounds