# Detour: practicing conversions

### 100 g of caffeine is how many moles?

(To make this problem interactive, turn on javascript!)

- 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 CO_{2} 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 CO
_{2}= 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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