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These are typical values. Your exact numbers may vary slightly depending on the version of the worksheet, but they should be very close.
( m = 50.0 , g ), ( \Delta T = 23.5 - 100.0 = -76.5°C )
"50.0 cm³ of 1.00 mol/dm³ HCl reacts with 50.0 cm³ of 1.00 mol/dm³ NaOH. Temperature rises from 19.5 °C to 26.3 °C. Calculate the enthalpy change per mole of water formed." Full ( q = mc\Delta T ) calculation, conversion to kJ, moles of water, sign determination, and final ( \Delta H ) with correct units.
By using Calorimetry Worksheet 2 Answers Chemsheets and other resources, you will become proficient in the concepts related to calorimetry, making you better equipped to tackle more advanced topics in chemistry.