What mass contains 6.0 * 1023 atoms? A)6.0 g of carbon B)16 g of sulfur C)3.0 g of helium D28 g of silicon

Silicon! 

One mole of a substance weighs the same as it's RAM (Relative Atomic Mass) in grams.

The RAM of silicon is ≈ 28.  Therfore one mole of silicon weighs ≈ 28g.

Hope this helps,

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- Loosifer