How would you be able to use the spectrum of each gas to establish its identity

If i can still dissolve more sugar into the solution at a certain temperature what would i call that solution

How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.

How many moles of sulfuric acid (h2so4) are needed to react completely with 6.8 moles of lithium hydroxide (lioh)? 2lioh + h2so4 → li2so4 + 2h2o a. 3.4 mol h2so4b. 6.8 mol h2so4 c. 10.2 mol h2so4 d. 13.6 mol h2so4