The number of moles of sodium dichromate from the number of moles of oxygen atoms can be determined through stoichiometry. Using the molecular formula of the compound, Na2Cr2O7, 1 mole of the compound contains 7 moles of oxygen. Hence, 14 moles O2*(1 mole Na2Cr2O7/ 7 mole O2) is equal to 2 moles <span>Na2Cr2O7.</span>
Answer:
4, 3, 2
Explanation:
so I would balance this equation first by identifying the 3 2 inbalance
usually with these you find a common factor that suits other variables
eg. 6 so times the right side by 2 and the O2 by 3
now O are equal on both sides and to equalise fe times the left by 4
the equation is balanced
I believe that number 27 is A