"how many atoms are in 169 g of calcium"

First calculate the number of moles. Molar mass of Calcium = 40.08 g/mol

Number of moles = 169 g / (40.08 g / mol) = 4.217 moles

Using Avogadros number, we can get the number of atoms:

Number of atoms = 4.217 moles * (6.022 x 10^23 atoms / moles) = 2.54 x 10^24 atoms

the product of the pressure and volume is also constant

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.