The normal boiling point of methanol is 64.5 °C. What is the
boiling point in Kelvin?

337.5 K or 337.65 K

Explanation:

Celsius to Kelvin

Celsius + 273 = Kelvin

64.5 + 273 = 337.5 K

                                      OR

Celsius to Kelvin

Celsius + 273.15 = Kelvin

64.5 + 273.15 = 337.15 K

Any of the answer can be written. To convert Celsius to kelvin, 273.15 is to be added to the temperature in Celsius. But usually, 273 is added instead of 273.15

Hope this answer helps you.

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chemical properties of thing