Acetylene combusts according to with per reaction as written

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

Problem

Acetylene combusts according to

\text{C}_2\text{H}_2(g)+\tfrac{5}{2}\,\text{O}_2(g)\rightarrow 2\,\text{CO}_2(g)+\text{H}_2\text{O}(l)

with

\Delta H=-1299\,\text{kJ}

per reaction as written. If

3.50\,\text{g}

\text{C}_2\text{H}_2

is burned in the presence of

3.50\,\text{g}

\text{O}_2

, what is the approximate heat released? (a)

+57\,\text{kJ}

(b)

-57\,\text{kJ}

(c)

-28\,\text{kJ}

(d)

-175\,\text{kJ}