a confiscated white substance, suspected of being cocaine, was purified by a forensic chemist and subjected to elemental analysis. combustion of a 50.86 mg sample yielded 150.0 mg of CO2 and 46.05 mg of H2O. analysis for nitrogen showed that the compound contained 9.39% N by mass. the formula of cocaine is C17H21NO4. can the forensic chemist conclude that the suspected compound is cocaine

The correct answer to this question is 28 

Those are different gas lawshere is a brief description of themcharles's law states that volume and temperature are directly proportional to each other as long as pressure is held constant.  boyle's law asserts that pressure and volume are inversely proportional to each other at fixed temperature.gay-lussac's law introduces a direct proportionality between temperature and pressure as long as it is at a constant volume.    source:

#2- the hno3 has a h+ ion and the naoh has an oh- ion