To do this, we'll convert the mass of each reactant to moles and compare their mole ratios.
For oxygen:
$$5.0 \, g \, O_2 \times \frac{1 \, mol \, O_2}{32.0 \, g \, O_2} = 0.156 \, mol \, O_2$$
For sulfur:
$$6.0 \, g \, S_8 \times \frac{1 \, mol \, S_8}{256.5 \,
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