Q. 20

# White phosphorus

P4 + 6Cl2 4PCl3

PCl3 + 3H2O H3PO3 + 3HCl} x 4

Overall reaction will be,

P4 + 6Cl2 + 12H2O 4 H3PO3 + 12HCl

1 mole of white phosphorus produces 12 moles of HCl…………..a)

1 mole of HCl weighs 36.5g,

so weight of 12moles will be, 12 x 36.5=438g……………………………i)

1 mole of white phosphorus weighs 124 g………………….ii)

Equation a) implies that 124g of phosphorus is used to produce 438g of HCl

So 1g of phosphorus would give= 438/124 g of HCl

62 g would give= (438/124) x 62 = 219 g of HCl

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