mastering Calculate the standard enthalpy change for the reaction 2A + B 2C + 2D
ID: 837547 • Letter: M
Question
mastering
Calculate the standard enthalpy change for the reaction 2A + B 2C + 2D Use the following data: Express your answer in kilojoules. For the reaction given in Part A. how much heat is absorbed when 3.40mol of A reacts? Express your answer numerically in kilojoules. The forensic technician at a crime scene has just prepared a luminol stock solution by adding 10.0g of luminol into a total volume of 75.0 mL of H2O. What is the molarity of the stock solution of luminol? Express your answer with the appropriate units. Before investigating the scene, the technician must dilute the luminol solution to a concentration of 2.00 Times 10-2M. The diluted solution is then placed in a spray bottle for application on the desired surfaces. How many moles of luminol are present in 2.00 L of the diluted spray? Express your answer with the appropriate units.Explanation / Answer
b) for 2 moles Delta H = 267 kJ
for 3.4 moles Delta H = 267*3.4/2 = 453.9 kJ
Answer is 453.9 kJ
d) M = 2*10^-2 M
V = 2L
No of moles = M*V = 4*10^-2 = 0.04
Answer is 0.04 moles
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