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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.
1 68% - How many oxygen atoms are present in 7 00 gram of water? 2  75% - How many atoms of oxygen are contained in 36 grams of water molecules? 3  48% - How many moles of oxygen atoms are needed for the reacton in an experiment 1 mol of propane is burned to form carbon dioxidee and water? 48% - How many moles of oxygen atoms are needed for the reacton in an experiment 1 mol of propane is burned to form carbon dioxidee and water? 2  33% - If the ratio of carbon atoms to hydrogen atoms to oxygen atoms in a molecole of dicyclohexyl maleate is 4 to 6 to 1 what is the molecular formula if t?