If the reaction of 4.50 moles of sodium with excess hydrofluoric acid produced an 85.0% yield of hydrogen gas, what was the actual yield of hydrogen gas? unbalanced equation: na + hf “yields”/ naf + h2 1.91 mol h2 2.25 mol h2 2.65 mol h2 3.82 mol h2

What is avogadro’s number, and why is it useful

Which statement best summarizes the importance of ernest rutherford’s gold foil experiment? it proved that all of john dalton’s postulates were true. it verified j. j. thomson’s work on the atomic structure. it showed that an electron circles a nucleus in a fixed-energy orbit. it showed that a nucleus occupies a small part of the whole atom.

Which statement accurately represents the arrangement of electrons in bohr’s atomic model?