Another conversion that can be made with the unit moles involves substances in the gaseous state, Substances that are a gas at S. T.P (standard temperature and pressure which is the only kind we will deal with for now) will have a volume of 22.4L for every 1 mole, This means that if I have a certain number of moles of gas, then I can determine the volume of that gas,
Or if I have a certain number of Liters of the gas, than I can determine the number moles,

Answer the following two questions, handwriting your work, and upload a picture of that work, with your
answers boxed,
1) How many moles of Hydrogen gas are present in a sample of 37.6 L?
2) How many liters of Oxygen gas are present in a sample of 0.36 moles?
Bonus: How many molecules of Oxygen would be present in the sample from question #2?

C. chemical changeshope i : )

Answerthis solution will not form a precipitateexplanationsolubility equilbrium:         pbf₂(s)  ⇄ pb²⁺(aq) + 2 f⁻(aq)the solubility product expression is    (we exclude solids from the equilibrium expression).now suppose we have the trial ion product q, which we can define as    then, we can interpret  q as the product of the concentration of the ions that we have and ksp as the product of the ion concentrations that are needed to form a saturated solution.if q > ksp, then that implies that there will be a surplus of ions that exceed the amount that is required to form a saturated solution. a precipitate will then form (the precipitate continually  forms until the surplus ions are removed and q is decreased to ksp's value).if q = ksp, the saturated solution that forms is barely saturated and the precipitate will be minimal.if q < ksp, then the ion concentration will not be enough to form a saturated solution (so no precipitate).using our information, we calculate the trial ion product:     since q = 2.7  × 10⁻⁸ < ksp =  4  ×  10⁻⁸, a precipitate will not form.