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In a coffee-cup calorimeter, 1.60 g of NH4NO3 is mixed with 78.0 g of water at an initial temperature of 25.00°C. After dissolution of the salt, the final temperature of the calorimeter contents is 23.35°C. Assuming the solution has a heat capacity of 4.18 J/°C · g and assuming no heat loss to the calorimeter, calculate the enthalpy change for the dissolution of NH4NO3 in units of kJ/mol.
A piece of charcoal from a tree killed by the volcanic eruption that formed the crater in Crater Lake (in Oregon) gave 7.0 disintegrations of carbon-14 nuclei per minute per gram of total carbon.
What are the concentrations of OH- and H in a 0.00085 M solution of Ba(OH)2 at 25 °C? Assume complete dissociation.
A solution of ethanol (C2H5OH) in water is prepared by dissolving 10.0mL ethanol (density is 0.79g/cc) in enough water to make 250.0mL of solution. What is the molarity of the ethanol solution?
How many total moles of ions are released when the following sample dissolves completely in water? 7.24x 10^20 formula units of NiCl2.
Write a balanced equation for the reaction between O2 and H2. ( I know its H2O but I want to make sure there is nothing left over from O2)
Phosphoric acid can be prepared by reaction of sulfuric acid with "phosphate rock" according to the equation: Ca3(PO4)2+3H2SO4 ---> 3CaSO4 + 2H3PO4 What is the molar mass of Ca3(PO4)2?
Propanoic Acid, HC3H5O2, is a weak acid. A 0.125 M solution of propanoic acid, HC3H5O2, dissociates 1.020%. Using this information, calculate the pH of the 0.125 M solution of propanoic acid.
Consider the titration of 44.2mL of 0.240M HF with 0.180 M NaOH . Calculate the at each of the following points. A) How many milliliters of base are required to reach the equivalence point
Use the van der Waals parameters for chlorine to calculate approximate values of (a) the Boyle temperature of chlorine and (b) the radius of a Cl2 molecule regarded as a sphere.
What is the pH at the half-stoichiometric point (that is, what is the pH when you have added 50% of the total volume of base required to react with all of the acid originally present?)
The isothermal compressibility of graphite is 1.56 × 10-7 bar-1. At what pressure is density equal to density of diamond?
Galvanized nails are iron nails that have been plated with zinc to prevent rusting. The relevant reaction is Zn2+(aq)+2e??Zn(s)
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