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In a calorimetry experiment, 0.497 g of potassium hydroxide are dissolved in 25.o ml of water (density = 1.00 gml, specific heat = 4.184 j g-1 °c-1) in an insulated container. the temperature of the water rises from 21.37 °c to 26.25 °c. what is the change ho for the following reaction? (neglect the heat capacity of the container)
KOH(s)=K+(aq)+OH-(aq)
-57.6 kJ/mol-510 kJ/mol-10.1 kJ/mol57.6 kJ/mol510 kJ/mol
Calculate the weight of KMnO 4 contained in 2 liters of a 0.15N (not M) solution.
A compound is 40.0 , 6.70 , and 53.3 by mass. Assume that we have a 100.- sample of this compound.The molecular formula mass of this compound is 180 . What are the subscripts in the actual molecular formula?
Species that have the same number of electrons are described as isoelectronic. What +2 ion is isoelectronic with Rb+ What -ion
how many moles of nitroglycerin were in the container originally? b) how many moles of gas(air) were in the container originally? c) how many moles of gas are in the container after the explosion?
silver chloride can dissociate into Ag+ and Cl- species. This inhomogenous equilibrium has K=1.8x10^-10. What is the concentration of Ag+ in solution at equilibrium?
Does your spectrum allow you to confirm that the structure of the product is a combination of the two reactants. Briefly explain.
Describe and explain the possible effect on your results of the following experimental errors or variations. a) you added only enough 3 M H2SO4 to bring the pH down to 4.
Normal fasting levels of blood glucose in human are around 800mg/L. What is the molarity of glucose in the bloodstreem
Specify whether a simple distillation or a fractional distillation would be more suitable for each of the following purifications, and briefly justify your choice.
Lithium will react with oxygen in a pressurized container to produce solid lithium oxide at 25°C. if 0.130 g Li(s) is placed in a 0.500 L container filled with oxygen at 1.90 atm
The first step in industrial nitric acid production is the catalyzed oxidation of ammonia. Without a catalyst, a different reaction predominates: 4NH3(g) + 3O2(g) ? 2N2(g) + 6H2O(g) When 0.0280 mol gaseous NH3 and 0.0250 mol gaseous O2 are placed ..
Use two separate t tests to compare results from lab Coat with those from lab A and lab B at the 95% confidence level. Comments on the sensibility of the time test results.
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