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how many moles of phosphorus are in a mixture containing 4.0x10^23molecules of PCL3

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4.0 x 1023 molecules of PCl3 x (1 mole PCl3 / 6.022 x 1023 molecules PCl3) x (1 mole P / 1 mole PCl3) = 0.66 moles P
 
OR
 
4.0 x 1023 molecules of PCl3 x (1 atom P / 1 molecules PCl3) x (6.022 x 1023 atoms P / 1 mole PCl3) = 0.66 moles P