How many suns are there?

Flourine is found to undergo 10% radioactivity decay in 366 minutes determine its halflife

Match the mixture with the substance// i really need on this guys (it’s a pic btw)

An excess of lithium oxide undergoes a synthesis reaction with water to produce lithium hydroxide li2o+h2o→2lioh if 1.05 g of water reacted, what is the theoretical yield of lithium hydroxide? a) 5.83 x 10–2 g lioh b) 1.17 x 10–1 g lioh c) 2.79 x 100 g lioh d) 1.40 x 100 g lioh