Technically, the answer should be 3.30 * 10^23 grams. But I think you mean either molecules, atoms, moles or grams of Ni2I6 with that number of molecules .
1 mole of Ni2 I6 = 6.02 * 10^23 molecules x [mole] = 3.30 * 10^23 molecules
1/x = 6.02 * 10^23 / 3.30 * 10^23 Cancel the 10^23 on the right side 1/x = 6.02 / 3.30 Cross multiply 3.30 = 6.02 x Divide by 6.02 3.30 / 6.02 = x x = 0.548 moles
what to do from here?
1 mole of Ni2I6 is 2 * Ni = 2 * 59 = 118 grams 6 * I = 6 * 131 = <u>786 grams</u> Total = 904 grams
Set up a proportion. <u>1 mole Ni2I6 </u> = <u>904 grams</u> 0.548 moles = x
1/0.548 = 904/x Cross multiply x = 0.548 * 904 x = 495.4 grams of Ni2I6 <<<<<< Answer.
