What type of bond is present in NBr?

If 34.2 grams of lithium react with excess water, how many liters of hydrogen gas can be produced at 299 kelvin and 1.21 atmospheres? 2 li (s) + 2 h2o (l) yields 2 lioh (aq) + h2 (g)

What are transitions between a liquid and gas called? identify which way they are transitioning

Chemistry worksheet - i am not sure what they are asking for exactly?