As an acid is added to neutral water the [OH-] will

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?

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.