How much work is done on (or by) the gases in each of the following at 298 K and

Question

How much work is done on (or by) the gases in each of the following at 298 K and 1 atm? Indicate whether the work is done on or by the gas.
(a) condensation of 15.9 g of water
kJ
[] work done on the gas
[] work done by the gas
[] no work done

(b) reaction of 8.8 g Na(s) and 12.0 g Cl2(g) to produce NaCl(s)
kJ
[] work done on the gas
[] work done by the gas
[] no work done

(c) decomposition of 18.1 g KClO3 into KCl(s) and O2(g)
kJ
[] work done on the gas
[] work done by the gas
[] no work done

(d) reaction of 3.3 g of H2(g) with 4.0 g of CO2(g) to produce H2O(g) and CO(g)
kJ
[] work done on the gas
[] work done by the gas
[] no work done

Explanation / Answer

8.8 g Na / 23 g/mol = .382 mol Na = 12.0 g Cl2 / 70.9 g/mol = .169 mol Cl2 2Na + Cl2 -> 2NaCl .169 mol Cl2 is the limiting reagent. So: .382 Na + .169 Cl2 -> .338 NaCl ?ng = 0 - .338 = -.338 mol w = -(-.338)(8.314)(298) = 838 J = .838 KJ work done on the gas

Related Questions

Navigate

• Browse (All)
• Browse H
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.