(2ai) Graham's law of diffusion states that the rate of diffusion of gas at constant temperature and pressure is inversely proportional to the square root of its vapour density. (2aii) (I) PB = 1.013*10^5Nm^-3 VB = 5dm^3 Pc= 3.039* 10^5Nm^-2 Vc= 5dm^3 PT= PB+PC PT = 1.013*10^5+3.03*10^5 PT= 4.052*10^5Nm^-2 (II) PT=(1.013*10^5*10) + (3.03*10^5*10) PT= 4.052*10^6Nm^-2 (2bi) No of mole of methane = 0.50mol, No of mole of oxygen= 1.5mol, 1mol of methane produces 2 mol of oxygen, 0.50mol of methane produces 2/1 * (0.50) = 1.0 mol of oxygen Methane is in excess of oxygen (2bii) 2mol of oxygen produces 2moles of steam, 1.5mol of oxygen produces 2/2*(1.5) = 1.5moles of steam (2biii) 3.0 = no of molecules/ 6.02*10^23 no of molecules = 3.0*6.02*10^23 = 18.06 * 10^23 particles =1.806*10^24 (2c) To 1cm^3 of unknown substance, add calcium hydroxide. The presence if milky solution confirms the presence of carbon(iv)oxide (2di) (I) By using calcium Chloride (II) Dry agent (2dii) Because it is less denser than air (2diii) Hydrogen perioxide and Cu are formed
Posted on: Mon, 23 Sep 2013 14:29:53 +0000
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