Which element is in group 2 and period 7 of the periodic table

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

Find the mass, in grams, of 5.00*10^23 molecules of f2

How is the way a mixture is combined different from how a compound is combined?