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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.
How many moles of oxygen atoms do 1.5 moles of CO{2} contain 3.0 mol One mole of silicon (Si) has a mass of 28.086g, and one mole of carbon has a mass of 12.011g. what is the mass of one mole of silicon carbide (SiC)? 40.097g x Find the mass in grams of 3.10 x 10 (23) molecules of Cl{2}