How does Hess's law help us determine the enthalpy change of a reaction? What is the unit of enthalpy? Define enthalpy of atomisation. What is enthalpy of steam? How to calculate lattice enthalpy Calculate the
Determine the amount of heat (in kJ) needed to take a 37.9-gram piece of ice (Delta Hfus = 6.02 kJ mol) to 37.9 C liquid water. Calculate the amount of heat required to convert 50.0 g of ice at -10.0 °C to +110.0 °C at 1 atm. \Delta H_{fus} of ice = 334 J/g, C_s...
Determine the energy change for the following reaction. Indicate if it is endothermic or exothermic. H_2 + Cl_2 \rightarrow 2HCl Is condensing steam exothermic? What types of reactions are always exothermic? Why is the formation of ionic compounds exothermic? What happens to the energy release ...
The process of baking PCBs is actually quite complicated. During baking, the original packaging must be removed before placing the PCB in the oven. The temperature used for backing must be over 100°C, but not too high, to prevent excessive expansion of steam during the baking process which ...
Now, we’ll also need to generate a kg of water. There are 1000 kg of water in a cubic meter, so we can determine the mass of 1 m2area by a 1 m deep as 1000 kg. To raise that much water 1 K in temperature takes 1,158,000 (1.158 x 106in scientific notation) joules, by si...
A kettle draws power of 2000 W and has an efficiency of 85%. You fill the boiler with 1.5 liters of water with a temperature of 15 degrees Celsius. The kettle's thermostat broke and the water boils even after it has reached i...
Determine the heat of vaporization of 42 g of Ethanol (MM = 46 g) at 78.4 degrees C. How much energy is required to vaporize 98.6 g of ethanol (C_2H_5OH) at its boiling point, if its molar heat of evaporation is 31.6 kJ/mol?
How much heat is required to vaporize 25.0 g of H2O(l) at 100 degrees C? ΔHvap = 40.67 kJ/mol The heat of Vaporization: Most physical changes such as heating, cooling, vaporization of substances have a heat flow involved. In the case of vaporizati...
How much heat needs to be released if a 95 g sample of ethyl alcohol condenses? Heat of Vaporization The heat of vaporization is the required heat that will be added to a substance so that it will evaporate. Every liquid substance has a property needed to change to v...
Determine the amount of heat required to convert 500.0 grams of liquid ethanol at 25.0 degrees Celsius into gaseous ethanol at 125 degrees Celsius. Calculate the amount of heat needed to melt 95.6 grams of sold ethanol (CH3CH2O...