In the reaction 2 AI2O3 --> 4AI+ 3O2what is the mole ratio of aluminum (Al) to oxygen gas (02)?

Joan writes four numbers on the board in standard form, and then she writes their scientific notation

In the millikan oil drop experiment they determined that every drop had a charge which was a while number multiple of -1.60x10^-19. if a drop has a total charge of -9.60x10^-19 then how many excess electrons are contained within the drop?

Determine the reaction and balance the following equations urgent due in the morning