stoichiometry

In chemistry, there are many reactions. I saw reations between gas bubbles with fire and between magnesium with fire. When we finished burning magnesium, the mass of magnesium became less than before.

These reactions were really interestion and caught my attention.

Stoichiometry calculate reactants and products. It is also about the mass, moles of two property. I learned formulas which was g x to mol x to mol y to gram y. It was pretty complicated. We had to get a mass and calculate before we do the real calculation. The mole has 6.022 x 10 to the 23power. I learned chemists are doing experiments with exact mass of element. I knew they didn't want to waste them. They calcutlated with periodic table. Periodic table has mass of one mole of every elements. So we could mass of mole easily by looking through the table.