Help please!!! One molecule of Iodine (I2) and two molecules of potassium (NaCl) combine in a reaction. How many atoms are in the products?

a. 6

b. 4

c. 3

d. 2

What overall charge must all compounds have

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?

What substance has a mass of 9.5g and volume of 2.1cm^3