Which of these equations is balanced? 1. 4Sb + 3O2 → Sb4O6

2. H3 AsO4 → As2O5 + H2O

3. SiO2 + HF → SiF4 + H2O

4. CO2 + NH3 → CO(NH2)2 + H2O

Consider the nuclear equation below. 239 > x + 4 he 94 2 what is x? 1.235 cm 96 2.243 u 92 3.235 u 92 4.243 cm 96

How many moles of magnesium is 3.01 x10^22 atoms of magnesium?

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?