A certain element has three isotopes. 92.2% has a mass number of 27.98, 4.68% has a mass of 28.98, and 3.09% has a mass of 29.97. The average atomic mass of the element is amu, and the element is .

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

Answer asap : ( a. how does mucus prevent the entry of pathogens? b. describe two ways white blood cells protect us from pathogens.

One nanometer is equal to how many meters?