Which of the following solutions to written problems shows answers ending in mass o...
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Step-by-step solution
The problem asks to identify the solution that results in a unit of mass. By analyzing the unit cancellations in each option, the third option correctly yields grams (g) as the final unit.
Answer
6.89 x 10^18 He atoms x (1 mol He / 6.022 x 10^23 He atoms) x (4.003 g He / 1 mol He) = 4.58 x 10^-4 g He