If you have 210.3 grams of an unknown compound that contains 12.3 grams of hydrogen (h), what is the percent by mass of hydrogen in the compound

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