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What is the mass of 0.0065 mole of ruthenium

6.5 mol Ru x101.07g Ru/1mol Ru = 0.656g Ru
Or is it 0.66g Ru

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How did you multiply 6 x 100 and get less than 600 something?
6.5 x 101.07 I have as 656.955. You are allowed two sig figures so you round that to 660 but should be written as 6.6E2.

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