Which best describes a compound such as magnesium oxide?

If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

What is the relation between concentration of reactants and the rate of chemical reaction?

Remember to use the proper number of significant figures and leading zeros in all calculations. gelatin has a density of 1.27 g/cm³. if you have a blob of gelatin dessert that fills a 2.0 liter bottle, what is its mass? 2540 g2500 g3.9 x 10-43.937x 10-4