Detour: practicing conversions
100 g of caffeine is how many moles?
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- I need a hint ... : The molecular weight of caffeine is 166 g/mol
- ...another hint ... : In order for the units to cancel out, the conversion
fraction needs mole on top and grams on the bottom.
I think I have the answer: 100 g * 1 mol / 166 g = 0.6 mol
And 100 g of CO2 in moles?
(To make this problem interactive, turn on javascript!)
- I need a hint ... : The molecular weight of C and O are 12 and 16. The molecular weight of CO2 = 12 + 2 * 16 = 44 g
- ...another hint ... : In order for the units to cancel out, the conversion
fraction needs mole on top and grams on the bottom.
I think I have the answer: 100 g * 1 mol \ 44 g = 2.3 mol
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