Gas is collected over water at 25 °C. The pressure in the container was 0.13 atm. Using a vapor pressure chart, what is the pressure of the dry gas?

Explanation:

Hello there!

In this case, according to this problem about partial pressures, we first use the Dalton's law in order to realize how the vapor pressure of water and the partial pressure of the gas contribute to the total pressure:

Thus, since the vapor pressure of water at 25 °C is 0.0313 atm, the partial pressure of the gas turns out to be:

Regards!

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.