Laboratory measurements provide the following enthalpy changes (each value includes…

CHEMISTRY · Single correct · AP · Chemistry · Thermochemistry · Thermochemistry

Problem

Laboratory measurements provide the following enthalpy changes (each value includes its experimental uncertainty): • 2SO₂(g) + O₂(g) → 2SO₃(g)  ΔH₁ = –198 ± 4 kJ • S(s) + 32\tfrac{3}{2}O₂(g) → SO₃(g)  ΔH₂ = –395 ± 5 kJ Using these data, determine the possible range of values for ΔH of the reaction S(s) + O₂(g) → SO₂(g). Assume the uncertainties are independent and combine additively. (a) from −301 kJ-301\,\text{kJ} to −291 kJ-291\,\text{kJ} (b) from −206 kJ-206\,\text{kJ} to −188 kJ-188\,\text{kJ} (c) from −303 kJ-303\,\text{kJ} to −289 kJ-289\,\text{kJ} (d) from −305 kJ-305\,\text{kJ} to −287 kJ-287\,\text{kJ}

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