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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.
32.00 grams of oxygen x 1 mole of oxygen atoms = 2 moles of oxygen atoms 16.00 g of oxygen This information can be used to figure out the formula of the gas. 54 Exploring the Chemical World, PGCC, 2003 1 mole of carbon and 2 moles of oxygen combined to form a compound. For every one atom of carbon there are two atoms of oxygen. The formula could be CO 2. The subscripts in a formula tell us the relative number of moles of the elements in the compound. Please note that the actual molecular formula could be C 2 O 4 since the relative number of C to O in this compound is also 1:2.