How much heat is evolved if 0.600 kg of so2 is burned in excess oxygen? 2so2 (g) + o2 (g) → 2so3 (g) δh°rxn = - 198 kj/mol?

Question

Harrison Vargas

Chemistry

13 May, 17:05

How much heat is evolved if 0.600 kg of so2 is burned in excess oxygen? 2so2 (g) + o2 (g) → 2so3 (g) δh°rxn = - 198 kj/mol?

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Simeon Hutchinson · Answer 1

First, we determine the amount of sulfur dioxide being burned in moles.

Molar mass = 32 + 16 * 2

Molar mass = 64 g/mol

Moles present = mass / Mr

Moles present = 0.6/64

Moles present = 0.009375

Next, the heat released per mole is given to us as being - 198 kJ/mol

We multiply the number of moles by this to get:

198 * 0.009375 = 1.85625 kJ

1,856 Joules of energy will be released.