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50.00 mL of 0.10 M HNO2 (nitrous acid, Ka = 4.5 ´ 10-4) is titrated with a 0.10 M KOH solution. After 25.00 mL of the KOH solution is added, the pH in the titration flask will be
A 30.00 mL solution of potassium nitrate (KNO3) was diluted to 125.0 mL, and 25.00 mL of this solution were then diluted to 150.0 mL. The concentration of the final solution is 0.00307 M. Calculate the concentration of the original solution.
Calculate the final temperature of 37 mL of ethanol initially at 11 degrees C upon absorption of 624 J of heat. (density of ethanol =0.789 g/mL).
A 2.30 L sample of O2(g) was collected over a liquid at a total pressure of 785 torr and 25°C. When the O2(g) was dried (vapor of that liquid removed), the gas had a volume of 1.86 L at 25°C and 785 torr.
Zinc and sulfur react to form zinc sulfide by the equation shown below. How many grams of ZnS can be formed when 12.0 g of Zn reacts with 6.50 g of S? (Atomic mass: Zn = 65.38, S = 32.06).
what type of salt does copper oxide produce?
A voltaic cell employs the following redox reaction: Sn^2+(aq)+ Mn(s)--> Sn(s) + Mn^2+(aq) Calculate the cell potential at 25 under each of the following conditions.
Using this information and the Clausius-Clapyron equation (P = const•exp(-?Hvap/RT)), calculate the vapor pressure of 3 nm droplets of mercury.
The room temperature and pressure were 23.6 deg C and 763.4 mm Hg respectively. The residue had a mass of 3.1915 grams. What was the partial pressure of oxygen?
you have dissolved 0.298 g of soda ash into 80 mL of deionized water. It took 19.8 mL of 0.0998 M HCl to titrate the solution to the second equivalence point. What is the percent Na2CO3 in the soda ash?
an irregular shape of metal has a mass of 54.6 grams and displaces 2.83 cm^3 of water when dropped into a graduated cylinder filled with water. What is the identity of the pure metal?
Draw the Lewis structure for each including formal charges and describe in paragraph format how you went about solving the problem and making sure the answer was correct.
How does the energy of two photons corresponding to a wavelength of 451 nm (blue light) compare with the energy of three photons corresponding to a wavelength of 704 nm (red light)?
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