Answer:
See below for explanations
Explanation:
For A, the limiting reagent would be the 20.0 g of C7H6O3. If you notice, the amount of molecules for each element is smaller than the other. Think about it as making sandwiches and you have 4 pieces of bread, 6 slices of cheese, and 4 pieces of ham. If you tried to make sandwiches, you'd be left with no bread or ham, but 2 slices of cheese left. Therefore, cheese is the limiting reagent because there's too much to make anymore sandwiches. In this case, the amount of molecules of H and O are the same, but C7>C4, so there won't be enough to make complete products using everything.
For B, we need the molar mass of aspirin then we can use that to find the grams of aspirin.
Molar mass of C9H8O4 = 9(12.011)+8(1.0079)+4(15.999)=180.1582 g/mol (roughly 180 g/mol)
There are 9+8+4=21 moles of aspirin, now we can multiply this number by 180.1582 g/mol to get around 3783.3222 grams formed.
I've been out of practice with this in a while, but I believe these are correct.
