first year chem

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There are two naturally occurring isotopes of chlorine with ratios of 76% and 24%. One mole of PCl3 is made using a sample of isotopically pure chlorine gas (containing only one of the two isotopes). The product weighs 142 g. If chlorine gas containing the other isotope were used, one mole of the PCl3 would weigh?
Answer = 136g

  • first year chem -

    Well, since P weighs 31g and the isotopes of chlorine weigh 35 and 37

    So, one mole of PCl3 is either
    31+3*37=142
    or 31+3*35 = 136

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