Calculate the number of grams per mole in chalk using a periodic table. Grams in 1 mole Ca

Grams in 1 mole C

Grams in 1 mole O

Xz 3 =

Add those numbers to get total grams per 1 mole of chalk.

2. The mass of the chalk before they drew the picture:

40,000 g

(mass initial)

3. The mass of the chalk after they drew the picture:

17,000 g

(mass initial)

4. Subtract the weight after (mass final) from the weight before (mass initial) to obtain the grams used in the drawing.

5. Convert that to the number of moles by setting up a conversion (credit FlatWorldKnowledge. com for image), similar to how you worked through the Rice ‘O Rama activity.
If

grams is 1 mole, then

grams is

moles.

6. Calculate the number of molecules in your drawing using the number of moles and setting up another conversion.
* Remember there are 6.02 x 1023 molecules in 1 mole.

# molecules of chalk in the drawing: