chemistry question that i do not understand

Question

A)At TPN what volume of sulfur dioxide must be reacted with 3.5 l of dihydrogen sulphide to remove all the dihydrogen sulphide?

B) what mass of soufre do we obtain ?

Answer 1

I'm not sure what TPN is (NTP is normal T and P which varies somewhat - 20°C and 1 atm is what I usually use), but the first part can be answered directly regardless of P and T:

You need the reaction equation: SO₂ + 2H₂S -> 3S + 2H₂O

a) You can use the stochiometric relations between gases in terms of volume (if P, T const V is proportional to n - Avogadro's Principle). Therefore 3.5 l H₂S* (1SO₂/2H₂S) = 1.75 liters SO₂

b) Find the moles of S produced by solving the ideal gas law for the H₂S n = PV/RT

Then, moles H₂S *(3S/2H₂S)*(32 g/mole S) = g S