What is the empirical formula for a compound if a sample contains 3. 72 g of P and 21. 28 g of Cl? PCl5 PCl3 P2Cl10 P2Cl5.

start by isolating the variable on one side by adding 43w^2 to both sides.   the equation will read:

25w^2+5=0

*subtract 5 from both sides*

25w^2=-5

*divide both sides by 25*

w^2=-1/5

*take the square root of both sides*

w=√(-1/5)

the square root of -1 is i.   the square root of 5 remains √5

the answer is i/√5.

hope this

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