How many grams of Al2O3 are needed to produce 24.5 Liters of O2 gas at STP?

What does the mass of 0.7891 mol of ferric oxide (fe2o3)

Two metal blocks that have slightly different temperatures are placed next to one another. after five minutes, they both have lower but equal temperatures. according to the law of conservation of energy, what  most likelyhappened? energy was created inside the blocks.energy was destroyed inside the blocks.energy was absorbed into the blocks from outside the system.energy was transferred from the warmer block to the cooler block.

Why is the bottom layer of a trophic pyrimid the