How to determine that 50% has indeed been converted, Chemistry

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How to determine that 50% has indeed been converted

Question:

You want to prepare a sample of mullite by reacting alumina and silica powders. If the activation energy is 210 kJ/mol and the reaction is 10% complete at 1400°C, how long will it take to convert 50% to mullite at 1400°C and at 1500%C? How will you determine that 50% has indeed been converted?

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