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Theoretical yield is the value you get if your reaction were to react to completion in an ideal world. However during experimentation there are a lot of things that can go wrong like residue on glassware, or side reactions that either take away from your original reaction or result in an impure product due to a byproduct. So you are unlikely to have an actual yield that is exactly the same as your theoretical yield in the real world.
Theoretical yields will always be greater because it is the best possible outcome in a chemical reaction where nothing went wrong and both substances produced to their full potential. In reality, this never happens so there will always be an incongruence with the actual yield because some substance could've gotten stuck to the beaker or evaporated away so you'll never produce 100% of what you wanted in the beginning.
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