IStoichiometry Worksheet 1. Silver sulfide (Ag2S) is the common tarnish on silver objects. What mass of silver
sulfide can be made from 1.23 g of hydrogen sulfide (H2S) obtained from a rotten
egg? The reaction of formation of silver sulfide is given below:
4Ag(s) + 2H2S(g) + O2(g) – 2Ag S(s) + 2H2O(1) (Equation must first be
balanced.)
Reaction type _4Ag(s) + 2H2S(g) + O2(g)
Formula to solve
Balanced equation
Solve
Answer

answer: the enthalpy of the overall chemical reaction is +87.88 kj or +88 kj.

according to hess's law, the overall enthalpy of a reaction is the difference between the sum of enthalpy values of all the products and the sum of enthalpy values of all the reactants.

δh(reaction) = ∑nδh(products) - ∑nδh(reactants)

δh(reaction) = [δh +δh] - [δh]

δh(reaction) = [1(-287.02) + 1(0) ] - [1(-374.9)] kj = +87.88 kj

here, δh (pcl3) = -287.02 kj, δh(cl2) = 0, δh(pcl5) = -374.9 kj

therefore, enthalpy of the overall reaction is +87.88 kj or +88 kj.

> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.

answer: mole of the gas

answer: mole of the gasexplanation: