When rounding 9.08 to the nearest whole number, you would look at the hundredths place, which is 0. Since 0 is less than 5, you would round down. Therefore, 9.08 rounded to the nearest whole number is 9.
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First determine the mass of 2 lbs of NaOH - it's about 2 x 454 g = 908 g[Having to use a conversion factor introduces error.]A mole of NaOH is 40 g; 908 g/40 g/mole = 22.7 moles.
It is 910 - 730 = 900 - 720 (subtractin 10 from each term) = 180.
6.6273 rounded to the nearest thousandths is 6.627 Rounded to the nearest hundredths, it is 6.63. Rounded to the nearest tenths, it it 6.6. Rounded to the nearest ones, it is 7.