For the answer to the question above, <span>17.9 x 1.74 gram Mg = 31.15 gram Mg = (31.15/24.31) = 1.28 mole Mg </span>
<span>2 Mg + O2 ---> 2MgO </span>
<span>so 1.28 mole Mg reacts with 0.641 mole O2
I hope my answer helped you. Feel free to ask more questions. Have a nice day!</span>
it's the last one because it's depended on the rock layers