In the reaction 2 AI2O3 --> 4AI+ 3O2what is the mole ratio of aluminum (Al) to oxygen gas (02)?

Abullet found at a crime scene may be used as evidence in a trial if the percentage of metals match to the composition of metals in a bullet from the suspect's ammunition. a forensic scientist's analysis of the bullet shows that it contains 11.9 g of lead, 0.5 g of tin, and 0.8 b of antimony. what is the percentage of lead metal in the bullet? express your answers to the one's place.

Iknow #2 is d. i just need to know why

In the following redox reaction which is the oxidizing agent and which is the reducing agent? alcl3 + na nacl + al