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**florx** A chemist is studying the properties of a bronze alloy (mixture) of copper and tin. She begins with 2kg of an alloy that is one-half tin. Keeping the amount of copper constant, she adds small amounts of tin to the alloy. Letting x be the total amount of tin added,

C(x) = Concentration of tin = Total amount of tin/Total amount of alloy

a) Find a formula for C(x)

Is the answer for a); C(x) = x/(2 + x) or is it something different? Please correct me if I am wrong. Thank you.