The mass of 2.0 x 10-5 moles of uranium is 4.8 x 10-3 grams.
The molar mass of a substance is the mass of 1 mole of the substance.
The molar mass of uranium is 238 g.
This is the mass of 1 mole of uranium.
The mass of 2.0 x 10-5 moles of uranium = 238 g × 2.0 x 10-5
The mass of 2.0 x 10-5 moles of uranium = 0.00476 g = 4.8 x 10-3 grams
Therefore, the mass of 2.0 x 10-5 moles of uranium is 4.8 x 10-3 grams.
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