Le – 19 has an atomic mass of 19.0134 u, Le – 17 has an atomic mass of 17.4629 u, and Le – 15 has an atomic mass of 15.7384 u. Use the natural abundance and atomic mass of each isotope to determine the average atomic mass of Le .

One mole of zinc has a mass of 65.4 grams. approximately how many atoms of zinc are present in one mole of zinc? 32 × 1023 atoms 6 × 1023 atoms 66 atoms 65 atoms

How many molecules are in 6.0 moles of methane

The diagram shows the relationship between scientific disciplines.the names of some scientific disciplines have been removed from the boxes. which scientific discipline belongs in the blue box? a.physics b.biology c.chemistry d.metallurgy