What is the difference between accuracy and precision?

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the answer is Accuracy refers to how close measurements are to the "true" value, while precision refers to how close measurements are to each other. In other words, accuracy describes the difference between the measurement and the part’s actual value, while precision describes the variation you see when you measure the same part repeatedly with the same device.

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how this helped

the reaction mixture contains some ammonia, plus a lot of unreacted nitrogen and hydrogen. the mixture is cooled and compressed, causing the ammonia gas to condense into a liquid. the liquefied ammonia is separated and removed. the unreacted nitrogen and hydrogen are then recycled back into the reactor .

first one is the correct answer