Created by StemPy LabThe standard enthalpies of combustion are: ethyne, , ; graphite, ; hydrogen, (the water formed is liquid). What is the standard enthalpy of formation of ethyne, ?
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← A student pours 60.0 mL of 1.50 M nitric acid into 140.0 mL of 0.500 M potassium hydroxide solution in an insulated cup with a lid. Both start at the same temperature, and the mixture warms by 4.54 K. The cup itself takes up 48 J for each kelvin. The solutions have a density of 1.00 g mL⁻¹ and a specific heat of 4.18 J g⁻¹ K⁻¹. What is the size of the enthalpy of neutralisation, in kJ mol⁻¹ of water formed, to the nearest integer?Methanol boils at 64.65 °C (337.8 K) under a pressure of 1 bar, and its enthalpy of vaporisation there is 35.3 kJ mol⁻¹. Liquid and vapour are at equilibrium at the boiling point. What is the entropy change when one mole of liquid methanol turns to vapour at its boiling point? →
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