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How to carry out a calorimetry experiment to determine the delta H for the exothermic reaction of Ca(OH)2 (s) and HCl (aq). Predict how each of the following will affect the calculated value of Delta H. (the value calculated for delta H for this reaction is a negative value so choose your answer from the following: delta H will be too low, delta H will be unaffected, delta H will be too high)a) Spill a little bit of the Ca(OH)2 on the bench top before adding it to the calorimeter.b) Because of a miscalculation, you add an excess of HCl to the measured amount of Ca(OH)2 in the calorimeter.c) Ca(OH)2 readily absorbs water from the air. The Ca(OH)2 sample you weighed had been exposed to the air prior to weighing and had absorbed water.d) After weighing out Ca(OH)2, the sample sat in an open beaker and absorbed water.
The temperature of a lead fishing weight rises from 15 oC to 45 oC as it absorbs 22.5 kJ of heat. What is the mass of the fishing weight in grams? Heat capacity of lead is 0.128 J/g oC.
What molar ratio of benzoate ion to benzoic acid would be required to prepare a buffer with a pH of 5.20? [Ka(C6H5COOH) = 6.5 × 10-5]
What is the mass, and the volume, of this seawater that contains 1.00 g of oxygen?
when 7.50g of magnesium reacts with 9.50g hydrochloric acid, hydrogen gas is formed. what is the limiting reagent?
How many grams of dry NH4Cl need to be added to 1.60 L of a 0.700 it M solution of ammonia, NH_3, to prepare a buffer solution that has a rm pH of 8.62? K_b for ammonia is 1.8 * 10^{-5}
Calcium carbide reacts with water to form acetylene and calcium hydroxide. From the following enthalpy data calculate Delta Hf for CaC2
Draw the major product for each of the following reactions. Make sure that you draw a major product that could be isolated, not just an intermediate or something that would be present only in low equilibrium population.
Suppose that 180 g of ethanol at 26 ? C is mixed with 225 g of ethanol at 83 ? C at constant atmospheric pressure in a thermally insulated vessel.
The Eu(III) standards added to the groundwater sample contained 0.181 ng/mL (ppb) of Eu(III). Calculate the concentration of Eu(III) in the groundwater sample.
So what have we discovered? What is the elemental identity? Show work in detail please. Displacement - 0.00202 L
An unknown gas has been determined to have the empirical formula CH2. At 27°C and 0.966 atm, the gas has a density of 1.65 g/L. What is the molecular formula of this gas
Which of the following numbers is the smallest?
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