1.
O2 + 2CO ---> 2CO2
CO is the limiting reagent.
20cm³ of CO reacts with 10cm³ of O2 to produce 20cm³ of CO2
Remaining gases: 10cm³ of O2 , 20cm³ of CO2
Not sure why the answer stated 30cm³ of CO2
2.
1 mole of water, H2O(l), has a mass of 18g
1 mole of steam, H2O(g), has a mass of 18g
24dm³ of water has a mass of 24000g (density of water =
1g/cm³)
1 molecule of water is equal to 1/(6*10^23) mole of water which
does not have a mass of 18g
2 moles of H2 and 1 mole of O2 has a mass of 2*2+32 = 36g
3.
Mass of Al when expressed as a fraction of mass of Al2O3 is
(27*2)/(27*2 + 16*3) = 54/102
Mass of Al in 204g of Al2O3 = 54/102 * 204 = 108g