What is the half-life of a radioisotope if a 20 g sample becomes 5 g after 2 days?

Determine the empirical formula of a compound containing 40.6 grams of carbon, 5.1 grams of hydrogen, and 54.2 grams of oxygen. in an experiment, the molar mass of the compound was determined to be 118.084 g/mol. what is the molecular formula of the compound? for both questions, show your work or explain how you determined the formulas by giving specific values used in calculations.

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Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.