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Evaluate the change in temperature when 2 g of sodium chloride is dissolved in 260.0mL of water initially at 24 C. Explain the heat capacity of water is 4.184 J/mL/K. Neglect the heat capacity of the NaCl.
Species ?fH (kJ/mol)NaCl(aq) -407.3NaCl(s) -411.2
What mass of solid sodium formate (of MW 68.01) must be added to 110 mL of 0.55 mol/L formic acid (HCOOH) to make a bu?er solution having a pH of 3.84? Ka = 0.00018 for HCOOH
Calculate the energy transferred as heat to raise the temp of 55g aluminium from 22.4 degrees C to 94.6 degrees C?
How many molecules of carbon dioxide will be formed if 4.89 g of propane, C3H8, is burned with excess oxygen. Correct Answer : 2.00 × 1023 molecules
When 27 mL of a 405 mL stock solution containing 2.3 M AlCl3 is diluted to 81 mL, what is the concentration of Al3+ in the new solution?
How many molecules of substance B are produced when 30.0 g of substance A reacts? The molar mass of substance A is 23.5 g/mol. A) Convert the mass of A to moles
If the unknown had been acetaminophen, how much water would it take to dissolve 1.00 g of it in boiling water. Solubility: c.w. (1g/ 70 mL) b.w. (1g/ 20 mL)
Would the presence of a nitro group in the 4- and 4'- positions in benzophenone increase the frequency of the carbonyl stretch or decrease it? Explain using resonance structures.
temperature of 15.4°C is placed flat on a sheet of iron weighing 21.3 g and at a temperature of 46.6°C. What is the final temperature of the combined metals?
Draw resonance structures for the carbocation that could be formed from (E)-2-butenyl trifluoromethanesulfonate. (2) One of the resonance structures for this carbocation should be a more important contributor to the resonance hybrid than the other
According to Charles Law, for a fixed quantity of gas at constant pressure, which of the given quantities is constant? V/T, VXT, or V+T
For each of the following bonds, indicate the posotive ?^+ end and the negative ?^- end. Draw an arrow to show dipole for each: a) SI--Br; b) Se--F; c) Br--F; d) N--H; e) N--P.
What wavelength lambda should the astrophysicist look for to detect a transition of an electron from the n= 7 to the n=3 level
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