What is the average atomic mass of hafnium given the following abundance information on the isotopes? [Hf-176 (mass 176 amu) has an abundance of 5%]
[Hf-177 (mass 177 amu) has an abundance of 19%]
[Hf-178 (mass 178 amu) has an abundance of 27%]
[Hf-179 (mass 179 amu) has an abundance of 14%]
[Hf-180 (mass 180 amu) has an abundance of 35%]

178.55

Explanation:

176 × 0.05+ 177 × 0.19 + 178 × 0.27 + 179 × 0.14 + 180 × 0.35 = 178.55

distance, luminosity, brightness, radius, chemical composition, and temperature

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.