Given that nasa needs 151,200 g of oxygen (o2) per person for a mission, how many grams of water (h2o) does nasa need to ship to meet the oxygen demands? use stoichiometry to determine your answer. show your work for this 3-step problem. make sure to balance the equation first. h2o (l) → h2 (g) + o2 (g)

Identify one disadvantage to each of the following models of electron configuration: -dot structures -arrow and line diagrams -written electron configurations type in your answer below. (answer) -dot structures do not show the distribution of electrons in orbitals and take up a lot of space. -arrow and line diagrams take up a lot of space and make it difficult to count electrons. -written configurations make it easy to lose count of electrons and do not show the distribution of electrons in orbitals.

An alloy contains 66 g of pure zinc. what is the percentage of zinc in the alloy? express your answer to two significant figures and include the appropriate units.

In which block of the periodic table is uranium (u) found? s blockd blockp blockf block