PLEASE HELP, I need my work done by Monday !!

Which of the following is always a reactant in a combustion reaction? oxygen nitrogen hydrogen carbon

Determine the percent sulfuric acid by mass of a 1.61 m aqueous solution of h2so4. %

The conventional equilibrium constant expression (kc) for the system below is: 2icl(s) ⇄ i2(s) + cl2(g) [cl2] ([i2] + [cl2])/2[icl] [i2][cl2]/[icl]2 none of the listed answers are correct [i2][cl2]/2[icl]