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When an atom of an element is formed from its constituent components it weighs less than the sum of free electrons, neutrons, and protons that make it up. This phenomenon is called mass defect. Explain why this phenomenon happens?
Which of the following solutions has the highest pH at 25?C?
A 13 mL sample of a solution of Pb(ClO3)2 was diluted with water to 17 mL. A 15 mL sample of the dilute solution was found to contain 0.027 moles of Pb2+. What was the concentration of Pb(ClO3)2 in the original undiluted solution?
Imagine that you have a 7.00 gas tank and a 4.50 gas tank. You need to fill one tank with oxygen and the other with acetylene to use in conjunction with your welding torch.
a chemist makes an hbr hydrogen bromide sample and observes that this sample occupies capacity of 279 ml at the
You have 4 ml of a 0.35 M solution. You take 50 µl of the solution, and add 8 ml of water. How many ‘fold' have you diluted the solution. What is the concentration of the diluted solution
At a particular temperature, N2O5 decomposes according to a first-order rate law with a half-life of 3.0 s. If the initial concentration of N2O5 is 1.0 × 1016 molecules/cm3, what will be the concentration in molecules/cm3 after 11.3 s?
Find the equilibrium partial pressures of A and B for each of the following different values of Kp . Assume that the initial partial pressure of B in each case is 1.0 atm and that the initial partial pressure of A is 0.0 atm . Make any appropriate..
Propose a synthesis (curved arrows, lone pairs included) of BAC (benzylalkyldimethylammonium chlorides) from PhCHO (benzaldehyde), a C12-18 alkyl chloride (R-Cl) mixture, and (CH3)2NH (dimethylamine).
What is the change in internal energy (?E) when a system loses 10 kJ of energy and 5000 J of work is done on the system?
An aqueous solution of nickel acetate is electrolyzed for 3 hours with a 1.8 ampere current. What mass of nickel is produced?
In a vessel with a volume 3 m^3 you put 0.03m^3 of liquid water and 2.97m^3 of water vapor so the pressure is 101.33 kPa.
A solution is made by dissolving 21.7 g of HCl in enough water to make 822 mL of solution. Calculate the pH of the solution at 25 degrees Celsius
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