You have 65g of carbon dioxide.How many moles of carbon dioxide is this

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This is not a difficult problem but you need to use stoichiometry in order to figure it out.  First you need to find grams per 1 mole of CO2, so you take the atomic mass of oxygen (15.99) and multiply it by 2; and then you add that answer (32) by 12, which is the atomic mass of carbon. You should get an answer of 44.  44 becomes you denominator in you stoichiometry equation.  Then you just set up the equation:  65 g CO2  x  (1 mole)/(44 g CO2)   =  1.48 moles of CO2