A calorimeter experiment was performed in which a 2grm sample of KBr was dissolv
ID: 1054407 • Letter: A
Question
A calorimeter experiment was performed in which a 2grm sample of KBr was dissolved in 35 grams of water (c = 4.18 j/g degree C). Lowering the temperature of the water from 22 degree to 19.73 degreec. What was the heart of dissolution for this process? Based up on the results of this experiment, what is the slandered enthalpy of the reaction KBr rightarrow k^+ + Br^- How much heat is required to produce 125 grains of aluminum metal by the reaction What is the heat of the reaction N_2 + 5/2 O_2 rightarrow N_2O_3, given: Using the table provided, determine the heat of reaction for: What volume docs 35 grams of N, occupy at 30 degreeC, 780 mm Hg pressure? An unknown gas has a density of 1.03 g/1.at I atm. 25 degreeC. What is the molar mass of the gas? Consider the reaction: 2C_6H_6 + 15O_2, + 6H_2O, A 50 ml sample of C_6H_6 (D = 0.792 g/ml) is burned in a 3 liter flask at 35V. What is the pressure of the CO_2 produced? A 3 liter flask at 25 degreeC is filled with a mixture of N_2 and O_2 to a total pressure of 5 atm. three were 10 grams of N, in the flask. How many grams of O, were present? Argon requires 18 seconds to effuse through a hole. A gas MV, requires 24 seconds. When element is X in the formula NX_3, ?.Explanation / Answer
A)
Q = mw*Cw*delta T
= 35*4.18*(22-19.73)
=332.1 J
Answer: 332.1 J
B)
number of moles of KBr = mass/molar mass
= 2 / 119
= 0.01681 mol
deltaH = Q / mol
= 332.1 J / (0.01681 mol)
=19760 J/mol
=19.76 KJ/mol
Answer: 19.76 KJ/mol
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