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1) That looks right. 2) Step 1: Moles=Mass/Mr, so it's 144/72= 2mol. Step 2: Stoichiometry means the ratio of oxygen to pentane is 1:8 so moles of oxygen is moles of pentane times 8. 2*8=16mol of oxygen. Step 3: 16= 9.6*10^24. 3) The ratio of oxygen to carbon in CO2 is 1:2. so it's 192/3 = 64.
Report Abuse. The ratio between Al(OH)3 and H2SO4 is 2: 3 0.500 mol Al(OH)3 react with 0.500 x 3 / 2 =0.750 moles of H2SO4 we have 0.500 moles of H2SO4 so it is the limiting reagent Moles Al2(SO4)3 = 0.500/3 = 0.167 Moles Al(OH)3 needed = 0.500 x 2 / 3 =0.333 moles Al(OH)3 in excess = 0.500 - 0.333 =0.167.