C5E

1: the volume taken up by 3 moles of Carbon dioxide:

24x3= 72 dm3

2:How many moles of hydrogen are present in 240 cm3?

24 000 / 240  = 100                             240cm3 of H is 0.01 mole

3: I have 64kg of Oxygen how many moles of molecules is this?

O2= O + O

= 16 + 16

= 32g of Oxygen is 1 mole

64kg O2 = 2 moles of oxygen

Volume: 2 x 24 = 48dm3 (48 000 cm3)

NUMBER OF MOLES =

MASS GIVEN / MOLAR MASS