Question

The value of δh° for the reaction below is -482 kj. calculate the heat (kj) released to the surroundings when 24.0 g of co (g) reacts completely. 2co (g) + o2 (g) → 2co2 (g)

Answer 1

The given thermochemical equation is:

$2 CO (g) + O_{2}(g) --->2CO_{2}(g)$ Δ$H^{0} = -482 kJ/mol$

Mass of CO given = 24.0 g

Moles of CO = $24.0 g CO * \frac{1 mol CO}{28 g CO} = 0.857 mol CO$

Finding out the heat released to the surroundings when 24.0 g CO:

$0.857 mol CO * \frac{482 kJ}{2 mol CO} = 207 kJ$

Therefore, 207 kJ of heat is released to the surroundings when 24.0 g CO reacts completely.