How many liters of phosphine are produced when 34 L of hydrogen reacts with an excess of phosphorus under STP?

Used the balanced equation 2h2+ o2 - -> 2h2o. if you have 7.2 grams of o2 , how many grams of h2o can you produce ?

Which of the following elements would you expect to have the lowest ionization energy value? fluorine, lithium, neon, nitrogen

Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh