Answer
a) $1.11 moles Ne$
b) $ 4.67 g Ar$
c) $ 7.62 moles Xe$
d) $ 5.76\times10^{-4} g He$
Work Step by Step
Using the molar mass of the element provided, we can simply convert from grams to moles or vice-versa;
a) $22.5 g Ne\times\frac{1 mole Ne}{20.18 g/mol} = 1.11 moles Ne$
b) $0.117 moles Ar \times\frac{39.948 g/mole}{1 mole Ar} = 4.67 g Ar$
c) $1kg = 1000g Xe\times\frac{1 mole Xe }{131.293 g/mole} = 7.62 moles Xe$
d) $1.44\times10^{-4} moles He\times\frac{4.00 g/mole}{1 mole He} = 5.76\times10^{-4} g He$
