Answer : The mass of chlorine reacted with the phosphorus is, 53.25 grams.
Explanation :
First we have to calculate the moles of phosphorus.


Now we have to calculate the moles of 
The balanced chemical reaction is:

From the balanced chemical reaction, we conclude that
As, 2 moles of phosphorous react with 3 moles of 
So, 0.5 moles of phosphorous react with
moles of 
Now we have to calculate the mass of 

Molar mass of
= 71 g/mol

Therefore, the mass of chlorine reacted with the phosphorus is, 53.25 grams.
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Answer:
400 or 4x102 indicates only onesignificant figure. (To indicate that the trailing zeros are significant a decimal point must be added. 400. has threesignificant digits and is written as 4.00x102 in scientific notation.) Exact numbers have an infinite number of significant digits but they are generally not reported.
How will what move? What, exactly, are you asking?