To determine the type of material collected at a crime scene, the investigators have collected data from its combustion in a calorimeter. A 20.5 g piece of the material was heated to 94.4°C and
placed in 50.0 mL of water at 22.8°C. After thermal equilibrium, the final temperature of the
calorimetric system was 30.9°C. What was this unknown material?

Can someone me with 1 to 4 plz. fast

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Achemistry student weighs out 0.306 g of citric acid (h3c6h5o7), a triprotic acid, into a 250 ml volumetric flask and dilutes to the mark with distilled water. he plans to titrate the acid with 0.1000 m naoh solution. calculate the volume of naoh solution the student will need to add to reach the final equivalence point. be sure your answer has the correct number of significant digits.