T (°C) R(%) 150 160 170 180 190 200 210 35.5 37.8 43.6 45.7 47.3 50.1 51.2

A product is synthesized in a chemical plant that is subsequently used as a preservative for canned products. The yield of the process is temperature dependent. The following data are available. Consider an optimum yield of 38.5 to 45, whereby the plant operates at 175°C. If the working temperature drops to 162°C due to a breakdown, what will be the best yield until it is repaired?