4:3 lol. Just so you know for future reference the numbers in front of the respective atoms/compounds usually represent the number of atoms to try and balance the equation. But in this context it is also a ratio and it is also the number of moles. An example would be this: Mg+02 --> MgO - so one mole of Mg gives one mole of MgO. As you can see there are no numbers in front therefore it represents 1 mole. Say you had 0.144 moles of Mg how many moles of MgO would be produced? Using that concept (1 mol of Mg gives 1 mol of MgO) 0.144 mols would therefore be produced. 0.144 mol of Mg gives 0.144 mol of MgO. If it was like your reaction it would go like this: 2moles of 2Al2O3 gives 4 moles of Al or 3 moles of 02 Anyway hope this helps it took me ages to get the hang of just that lol. |