Why do scientists study the natural world to find solutions to human problems?

If 22.5 liters of oxygen reacted with excess of hydrogen, how many liters of water vapor could be produced?

Which of the following represents the ester functional group? a. -coo- b. -cho c. -cooh d. c=o

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.)