Answer:
(c, d)
Mole fraction,
\[{{x}_{A}}=\frac{{{n}_{A}}}{{{n}_{A}}+{{n}_{B}}}=\frac{\text{Moles}\,\text{of}\,\text{a}\,\text{component}}{\text{Total}\,\text{number}\,\text{of}\,\text{moles}}\]
(unitless)
\[Mass\,percentage=\frac{Mass\,of\,a\,component}{Total}\times
100(unitless)\]
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