Moles to Volume Conversion

I. @STP

            A. At a specific pressure and temperature one mole of any gas will occupy the     same area

                        1. At STP=  0° C and 101.3 KPa

                        2. The molar volume at STP is 22.4 L

Examples

            1. How many litres will 3.6 mol of H_2(g) occupy at STP?

            3.6 mol x (22.4L / 1 mol) = 80.64 L --> Sig figs = 81 L

            2. A certain gas is found to occupy 12.3 L at STP. How many moles of gas are       there?

            12.3 L x (1 mol/ 22.4 L) = 276 mol

            3. At STP an unknown gas is found to occupy 222 mL. How many moles of gas   are there?

            0.222 L x (1 mol/ 22.4)= 0.00991 mol

            4. A certain amount of chlorine occupies 2.3 L. Find (a) how many moles are      present  and then(b)  determine the mass of chlorine.

            (a) 2.3 L x ( 1 mol / 22.4) = 0.10 mol

            (b) 0.10 mol x [2(35.5*) g / 1 mol] = 7.1 g/mol

-->chlorine is diatomic = Cl₂ = 2(35.5)*

-Nicole