Question

Silver tarnishes in the presence of hydrogen sulfide and oxygen according to the below reaction.

How many liters of O2 at 100.˚C and 115 kPa would be needed to react with 10.00 grams of silver?

4Ag + 2H2S + O2 —> 2Ag2S + 2H2O

Answer 1

By ideal gas equation -

PV = NRT.......1)

P =115 KPa = 115000 KPa

T=100$^{0}C$ =373.15 k

R = 8.314 m$^{3} Pa /k/mol$

$N=\dfrac{m}{M}$ m = given mass M= Molar mass

N $=\dfrac {10}{107}=$ 0.093 moles

now putting all these value in equation ....1) we get-

115000$\times V =0.093\times 8.314\times 373.15$

V=$\ 2.50\times 10^{-3}\ m^{3}$