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What mass of this substance must evaporate in order to freeze 250 of water initially at 25? (The heat of fusion of water is 334 the specific heat of water is 4.18 .)
Calculate the reaction Zn(s) + 2HCl(aq) ! ZnCl2(aq) + H2(g) What mass of ZnCl2 (MW = 136.3 g/mol) can be prepared from the reaction of 3.27 grams of zinc (MW = 65.38 g/mol) with 3.00 grams HCl (MW = 36.46)?
Ethanol is a common laboratory solvent and has a density of 0.789 g/mL. What is the mass, in grams, of 143 mL of ethanol.
If a chemistry student collected 834 mL of gas at 25 degrees C and 8.00 x 10^2 torr, how many moles did she collect?
What is the mole fraction of ethanol in a solution made from mixing 299 grams of ethanol (C2H5OH) and 360 grams of water? (Round your answer to 2 places after the decimal.)
In a titration experiment, a 12.5 mL sample of 0.0500 M KOH neutralized 14.7 mL of HNO3 solution. Calculate the molarity of the HNO3 solution.
Using the de Broglie wave equation, calculate the speed, in m/s, at which an electron must travel to have a wavelength of 25.0 pm?
How many grams of dry NH4Cl need to be added to 2.50 L of a 0.500 it M solution of ammonia, NH3, to prepare a buffer solution that has a rm pH of 8.99?
what is the change in pH after addition of 10.0mL of 1.0M sodium hydroxide to 90.0mL oof a 1.0M NH3/1.0M NH4+ buffer? (Kb for ammonia is 1.8 X 10-5)
A 35.00 mL solution of 0.2500 M HF is titrated with a standardized 0.1356 M solution of NaOH at 25 C.
Ammonia can be oxidized in oxygen as shown: 4 NH3(g) + 3 O2(g) 2 N2(g) + 6 H2O(g). When 0.791 mol of NH3 and 0.814 mol of O2 are placed in a 1.00 L container at a certain temperature,
Find out What mass of the NaHCO3 reacts with the vitamin C When the tablet dissolves in H2O, it "fizzes" because the reason for this is the CHO3 reacts with the citric acid(C6H8O7 a weak organic acid) and the vitamin C?
Solid NaI is slowly added to a solution that is .0075M Cu+ and a .0087 M Ag+. Which compound will precipitate first (NaI, CuI, or AgI), calculate [Ag+] when CuI just begins to precipitate
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