15%,H:30%,O:55% calculate its empirical formula, molecular formula and degree of unsaturation.

1.C:63.15%,H:5.30%,O:31.55% calculate its empirical formula, molecular formula and degree of unsaturation.
2.identify its functional group from IR spectrum and also structure and label all peak (stretch or out of plane bend).1.which one is molecular ion peak and base peak identify at least one other fragment ion,