Copper has two naturally occurring isotopes. The isotope Cu-63 (mass 62.93amu) makes up 69.17% of the sample, and the isotope Cu-65 (mass =
64.98amu) makes up 30.83% of the sample. What is the average atomic
mass for chlorine?

Pinene is an unsaturated hydrocarbon found in pine resin. if pinene has m+ = 136 and contains 1 double bond(s) and 2 ring(s); what is its molecular formula? enter the formula in the form ch first, then all other atoms in alphabetical order; do not use subscripts. the formula is case-sensitive