Neither. For a start, it should be you're (short for you are), not your.
But more on point to your question, it would be:
What if you're one of the pieces..."
"one of" signifies there is a plural noun that follows.
Examples that replace "one" with a noun, so you can see the construction better:
The penny was one of the coins.
The slice of bread was one of the entire loaf.
The light was one of many street lights.
You are one of the students.
You are one of the users of the WikiAnswers website.
1lb=16oz 16:1.5=10 pieces and 2/3 (two thirds) 10.6 pieces
To convert kilograms into pieces, you need to know the weight of a single piece in kilograms. Once you have that information, divide the total weight in kilograms by the weight of one piece. For example, if one piece weighs 0.5 kg and you have 2 kg, you would calculate 2 kg ÷ 0.5 kg/piece = 4 pieces.
24
It's the length of each piece, if you cut up one inch into ten equal pieces.
If a pie is divided into 10 pieces and you get one of them, will each piece be bigger than if the pie is divided into 12? Of course each piece will be bigger. Same for 3 pieces of the pie.
Nope. "One piece of luggage . . . many pieces of luggage."
The correct spelling is one dimensional. A drawing on a piece of paper is one dimensional.
The spelling is one word "showpiece" (an excellent example on exhibition).
Usually one, unless the piece is in pieces.
many pieces
No, this is not a correct sentence. The correct one is, there is another beauty in the family.
half a piece of pie. pie
Only one sentence is correct. The correct sentence would be "He saw me going there".
You are allowed to touch one of your opponent's pieces in chess when your piece takes one.
4 pieces of A4 fit on one piece of A2.
A 102 centimmeter board is cut into two pieces so that one piece is five times as the other . How long is each piece
1lb=16oz 16:1.5=10 pieces and 2/3 (two thirds) 10.6 pieces