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A NaOH solution weighs 150 g, the weight of water being 125 grams. Such a solution contains 25% mass/mass of NaOH. True or False
A certain substance has a heat of vaporization of 69.72 kJ/mol. At what Kelvin temperature will the vapor pressure be 3.00 times higher than it was at 307 K?
A 6.269 g sample of NiCl2·2H2O is heated until all the water of hydration is removed. What will be the mass of the remaining NiCl2?
Depict the condensed structural formula for the hemiacetal formed by adding one ethanol molecule to each of the following
What are the individual monomers used in the synthesis of the polymer? How much of the polymer are produced each year in the United States?
What mass of this substance must evaporate in order to freeze 170 of water initially at 23? (The heat of fusion of water is 334 the specific heat of water is 4.18 .
If the O2 was the excess reagent, 8.3 mol of H2S were consumed, and 137.1g of water were collected after the reaction has gone to complain, what is the percent yield of the reaction?
Calculate the final hydrogen ion concentration of a solution after 25.0 mL of 0.500 M HCl is treated with 40.0 mL of 0.0500 M Ba(OH)2(aq) and diluted to 100.0 mL.
0.134 mole of KCl and 0.185 mole of CaCl2 were dissolved in water. calculate the total number of moles of Cl- ions in the solution.
If the aluminum block is initially at 25^C, what is the final temperature of the block after the evaporation of the alcohol? Assume that the heat required for the vaporization of the alcohol comes only from the aluminum block and that the alcohol ..
Calculate the pH of a solution prepared by dissolving 0.250 mol of benzoic acid (C7H5O2H) and 0.300 mol of sodium benzoate (NaC7H5O2) in water sufficient to yield 1.00 L of solution. The Kaof benzoic acid is 6.50 ⋅ 10-5.
Question- A 100 mL sample of .18 M HClO4 is titrated with .27 M LiOH. Determine the pH of the solution before the addition of any LiOH. a) Determine the pH after the addition of 30 mL of LiOH.
HbS has normal shape under normal conditions, but under conditions of low [O2] the hemoglobin forms fibrous aggregations, giving the entire red blood cell a sickle shape. (See image of eight HbS molecules at right.)
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