Homework Help: Chemistry

Posted by Veronica on Monday, December 3, 2012 at 11:58am.

Strontium metal is responsible for the red color in fireworks. Fireworks manufacturers use strontium carbonate, which can be produced by combining strontium metal, graphite (C), and oxygen gas. The formation of one mole of SrCO3 releases 1.220 x 103 kJ of energy.
a) Write a balanced thermochemical equation for the reaction.
b) What is ΧH when 10.00 L of oxygen at 25 oC and 1.00 atm is used by the reaction?

Chemistry - DrBob222, Monday, December 3, 2012 at 2:12pm
Sr + C + 3/2O2 ==> SrCO3 + 1.22E3 kJ
Use PV = nRT and calculate n for O2 at the conditions listed, then convert to mols O2. g = mols x molar mass.

(1.22E3 kJ/48g O2) x g O2 used = ?

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