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1.70 g of NH4NO3 is mixed with 79.0 g of H2O In a coffee-cup calorimeter, at an initial temperature =25.00 degree celsius. the final temperature of the calorimeter contents = 23.67°C After dissolution of the salt,. heat capacity of solution = 4.18 J/°C·g ( assuming no heat loss to the calorimeter) calculate the enthalpy change for the dissolution of NH4NO3 and expree your answer in units of kJ/mol.
use the half reaction method to balance each of the following in acidic solution except as indicated
the cu is drawn into wire whose diameter 2r is 8.50mm if the density of copper is 8.94 gcm 3 then determine how many
Calculate the pH of a solution that is .150 M in sodium formate and .200 M in formic acid (Ka=1.8*10^-4)
Neutron stars are believed to be composed of solid nuclear matter, primarily neutrons.If the radius of a neutron is 1.0 × 10-13 cm, calculate the density of a neutron in g/cm3. (volume of a sphere = ) Assuming that a neutron star has the same dens..
Strontium metal crystallizes in a cubic unit cell which has an edge length of 612 pm. If the mass of an atom of Sr is 87.62 amu, and the density of Sr metal is 2.54 g/cm3
Write the carbon first and the H second in the formula and use the underscore key to denote subscripts in the formula.
How many grams of the K2C2O4XH2O in the salt mixture remain unreacted (in excess). What is the percent by mass of each salt in the mixture
What is the pH of a 0.175 mol/L solution of sodium acetate, CH3COONa, at 25oC? (pKa=4.74 at 25oC for CH3COOH.) Give your answer accurate to two decimal places
The resulting solution is titrated to a starch endpoint with 34.81 mL of the thiosulfate solution. Calculate the concentration of the thiosulfate solution.
A flask containing only NO2(g) at an initial pressure of 8.60 atm is allowed to reach equilibrium. Calculate the total pressure in this flask at equilibrium.
How many moles of oxygen gas are needed to completely react to produce 0.94 moles of sulfur trioxide?
An antacid tablet containing magnesium hydroxide instead of calcium carbonate was dissolved in 10 mL of 0.2893 M HCL. 10 mL of this solutions was tritated to endpoint with 25.20 mL of 0.1007 M NaOH. How much magnesium hydroxide was in the antacid ..
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