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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.
There are many different ways to calculate the moles and grams of oxygen. but one mole of oxygen is always gonna equal 32 grams because its diatomic, meaning it only comes in â¦ nature as O2. so it would be the atomic mass of oxygentimes 2. 16*2= 32.+ 12 others found this useful.herefore, the gram molecular mass of oxygen gas is twice the atomic mass of oxygen, or about 32 gram â¦ s. Therefore, 32 g of oxygen gas constitutes 1.0 moles of oxygen, to the justified number of significant digits. 1 person found this useful. Noah Mitchelson.