You have the following equations: 2S (s) + 3O 2 (g) → 2SO 3 (g), Δ H = –792 kJ
2S (s) + 2O 2 (g) → 2SO 2 (g), Δ H = –594 kJ
2SO 2 (g) + O 2 (g) → 2SO 3 (g), Δ H = ?

What is the missing ΔH?

Question options:

+198 kJ

–198 kJ

–294 kJ

+294 kJ

The following reaction shows sodium carbonate reacting with calcium hydroxide. na2co3 + ca(oh)2 → naoh + caco3 how many grams of naoh are produced from 20.0 grams of na2co3? (molar mass of na = 22.989 g/mol, c = 12.01 g/mol, o = 15.999 g/mol, ca = 40.078 g/mol, h = 1.008 g/mol) 12.2 grams 15.1 grams 24.4 grams 30.2 grams

How is the way a mixture is combined different from how a compound is combined?

Which elements are found in glucose, the product of photosynthesis? a. carbon, hydrogen, and oxygen b. carbon and hydrogen c. carbon, nitrogen, and oxygen d. hydrogen, nitrogen, and carbon