1. How many grams of carbon are in 0.688 g of carbon dioxide?

It is necessary to know the

molar mass of each element

of carbon dioxide (CO2). We can find

that information on the Periodic Table of

Elements:

- Carbon atomic mass: 12 g/mol

- Oxygen atomic mass: 16 g/mol

2nd)

We need to calculate the

molar mass of carbon dioxide

. As the molecule of CO2 has 1 mole of

carbon and 2 moles of oxygens, the

molar mass of the molcule is:

(1 x 12g/mol) + (2 x 16 g/mol) = 44 g/mol

3rd)

Finally, if 1 molecule of dioxide carbon

has 12g of carbon, we can use a

mathematical Rule of Tree to calculate

mow many grams of carbon are in

0.688g of carbon dioxide:

12gC - 44gC02

0.699gC • 44gC02

12gC

1 = 2.52gC02

SO,

there are 2.52g of carbon in 0.688g of

carbon dioxide

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