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Moles Problem!

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tmisterr:
look at the first equation, 3 moles of Iodine form 2 moles of PI3 so 0.079 will form (0.079*2/3) moles of PI3. And now the second equation, one mole of PI3 will form 3 moles of Iodoethane so ((0.079*2/3)*3)=0.158 moles of iodoethane which is equal to 24.648 grams

nid404:
Basically

3moles of I2 gives 2 moles of PI3

the next reaction uses only one mole of PI3   ---> multiplying this eqn by 2 will give you the ratio


 
Hope ur gettin me  :-\

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