I’ll give you THE BRAINLIEST please answer ASAP

1. 4 Al + 3 O2 -> 2 Al2 O3
a. How many moles of Aluminum would be needed to react completely
with 8.0 moles of oxygen gas?
b. How many moles of aluminum oxide would be produced if 5.0 moles of
aluminum were reacted with an excess of oxygen?

2. CS2 + 3 O2 -> CO2 + 2 S02
If 85.5 grams of carbon disulfide are reacted with an excess of oxygen, how
many grams of sulfur dioxide would be produced?

3. 2 Br + 7 O2 -> 2 Br2 O7
If 425 grams of oxygen gas reacted with 350 grams of bromine, what should be the theoretical yield of dibromine heptoxide? Limiting reagent? Grams of Br2O7 produced?