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    Stoichiometry problem to find number of moles

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    A mixture 20.2g of P and 78.2g of Cl2 reacts completely to form PCl3 and PCl5 as the only products. Find mass of PCl3 formed?

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    moles P = mass / atomic mass = 20.2 g(1 mole)/(30.974 g) = 0.652 mole P
    moles Cl2 = mass / molar mass = 78.2 g(1 mole)/(70.906 g) = 1.103 mole Cl2

    the following reactions will take place:
    2 P + 3 Cl2 --> 2 PCl3 and PCl3 + Cl2 --> PCl5

    The reaction should first produce PCl3 then the excess Cl2 will allow production of PCl5. We will ...

    Solution Summary

    The following stoichiometric problem has been solved stepwise so one can understand the solution and use similar methodology to solve similar problems.