When 8 moles of lithium metal react with excess oxygen gas, how many moles of lithium oxide can be produced?

2li + o2 → li2o

2
4
8
16

Asolution of naoh has a concentration of 25.00% by mass. what mass of naoh is present in 0.250 g of this solution? use the periodic table in the toolbar if needed. 0.0625 g what mass of naoh must be added to the solution to increase the concentration to 30.00% by mass? g