[m a a r i.] Posted October 1, 2008 Report Share Posted October 1, 2008 im just stuck in one of my past paper homework.well it must be pretty easy for the IB1 and IB2 who have learned stoichiometry for chemistry already.well i dont know how to do this question, i just cant figure it outQuestion : How many oxygen atoms are present in 0.0500mol carbon dioxide. please can you show me the working as i just dont know how to solve it, thanks Link to post Share on other sites More sharing options...
~Lc~ Posted October 1, 2008 Report Share Posted October 1, 2008 you have to find the number of moles of oxygen basically.1 mole= 6.02* 10^23 atoms according to avegadros constantthe chemical formulae of Carbon Dioxide is CO2 so there is 2 oxygen atoms for every carbon atom, so to find the number of moles of oxygen multiply the # of moles of the compound by 2 so:2* 0.05 = 0.1 mol of Oxygenmol #of atoms1 6.02*10^23.01 xcross multiply: 0.1 * 6.02*10^23= 6.02*10^22 atoms Link to post Share on other sites More sharing options...
[m a a r i.] Posted October 2, 2008 Author Report Share Posted October 2, 2008 you have to find the number of moles of oxygen basically.1 mole= 6.02* 10^23 atoms according to avegadros constantthe chemical formulae of Carbon Dioxide is CO2 so there is 2 oxygen atoms for every carbon atom, so to find the number of moles of oxygen multiply the # of moles of the compound by 2 so:2* 0.05 = 0.1 mol of Oxygenmol #of atoms1 6.02*10^23.01 xcross multiply: 0.1 * 6.02*10^23= 6.02*10^22 atomsTHANKS LOADS LC. FINALLY GET IT Link to post Share on other sites More sharing options...
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