The decomposition of potassium chlorate produces oxygen gas according to 2 KClO (s) →…

CHEMISTRY · Single correct · A Level · Chemistry · Energetics · Energetics

Problem

The decomposition of potassium chlorate produces oxygen gas according to 2 KClO

_3

(s) → 2 KCl(s) + 3 O

_2

(g)

\Delta H_{\text{rxn}} = +89.5\,\text{kJ}\,\text{mol}^{-1}

of O

_2

produced. If

1.79\times10^{3}\,\text{kJ}

of heat is absorbed, what volume of O

_2

gas (in liters) will be produced at 298 K and 1.00 atm? (Use

R = 0.0821\,\text{L}\,\text{atm}\,\text{mol}^{-1}\,\text{K}^{-1}

.) (a)

978\ \text{L}

(b)

489\ \text{L}

(c)

448\ \text{L}

(d)

245\ \text{L}