Stoichiometry is a term chemists use to describe calculations that determine the relative quantities of reactants or products involved in a chemical reaction. Using stoichiometry, chemists can determine the amount of product that can be formed during a chemical reaction from a given amount of reactant. Chemists can also determine the amount of reactant needed to produce a desired amount of product using the same process.What is the minimum mass of oxygen needed to produce $75\mathrm{.}0$ grams of NO$2$ in the presence of excess NH$3?4$ NH$3($aq$)+7$ O$2($g$)4$ NO$2($g$)+6$ H$2$O$($l$)$ANSWER Unselected$29\mathrm{.}8$ g O$2$Unselected$52\mathrm{.}2$ g O$2$Unselected$91\mathrm{.}3$ g O$2$Unselected$45\mathrm{.}6$ g O$2$