1. A sample of hydrogen gas is collected over water in a flask at 23.5 C. The pressure in the flask is equilibrated with the atmospheric pressure. The atmospheric (barometric) pressure is reported as 746.7 torr. Determine the pressure of hydrogen gas in the flask.

Two atoms interact with each other as shown by the equation. complete the equation by filling in the missing parts. 1 2 3 4 5 h he li

For a research project, a student decided to test the effect of the lead(ii) ion (pb2+) on the ability of salmon eggs to hatch. this ion was obtainable from the water‐soluble salt, lead(ii) nitrate, which the student decided to make by the following reaction. pbo(s) + 2 hno3(aq) → pb(no3)2(aq) + h2o losses of product for various reasons were expected, and a yield of 86.0% was expected. in order to have 5.00 g of product at this yield, how many grams of pbo should be reacted? (assume that sufficient nitric acid, hno3, would be used.)

Helium decays to form lithium. which equation correctly describes this decay?