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

in the given question, the partial pressure is calculated by using the ideal gas equation, that is, pv = nrt

here, p is pressure, v is volume = 25 l, n is number of moles = 0.0104 moles, r is gas constant = -0.0821 l.atm / mol.k

t is temperature = 273 k

p = nrt / v

p = (0.0104 mol × 0.0821 l.atm / mol.k × 273 k) / 25 l

= 0.0093 atm