A given sample of a xenon fluoride compound contains molecules of the type XeFn where n is some whole number. Given that 9.03 × 1020 molecules of XeFn weighs 0.368 g, determine the value for n in the formula.

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  1. Xe = 131 g/mol
    F = 19 g/mol
    so XeFn = (131 + 19 n) g/mol
    (131+19n)g / 6*10^23 molecules
    but this stuff is
    .368 g/9.03*10^20 molecules
    .368/9.03*10^20 = (131+19n) /6*10^23
    131+19 n = 244.5 g/mol
    19 n = 113.5
    n = 6

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