4al + 3o2 > 2al2o3

the molar mass of o2 is 32.0 g/mol. what mass, in grams, of o2 must react to form 3.80 mol of al2o3?

a.) 60.8
b.) 81.1
c.) 122
d.) 182

When hydrogen peroxide (h2o2) is added to potassium iodide (ki) solution, the hydrogen peroxide decomposes into water (h2o) and oxygen (o2). the chemical equation for the decomposition reaction is: 2h2o2—> 2h2o + o2. what is the role of the potassium iodide in this reaction? a. reactant. b. product. c. precipitate. d. catalyst.