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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.
how many grams of sodium lactate must be added to a 1.00l solution of .400m lactic acid to make a buffer with a ph of
When the two cylinders are connected and the gases mixed, the pressure in each cylinder becomes 8.71 atm. What is the volume of cylinder B?
What is the pH after 0.150mol of HCl is added to the buffer from Part A. Assume no volume change on the addition of the acid. Express the pH numerically to two decimal places.
when 100g Mg3N2 reacts with 75.0g H20, 15.0g of NH3 is formed. What is the percent yield? Mg3N2+6H2O-->3Mg(OH)2+2NH3
Calculate the pH of a buffer made by mixing 50.0mL of 0.10M acetic acid (HC2H3O2) with 50.0mL of 0.10M sodium acetate (NaC2H3O2)
Complete and balance the following reaction as a molecular reaction. also label each t with aq for aqueous, s for solid, and g gor g. Kbr+Cl2
assume that while titration of vinegar sample with standard naoh takes place you misread the buret and the observed
The statements in the following multiple choices deal with various aspects of reaction rates
The combustion of propane illustrated by the following reaction releases 2428 KJ per mole of reaction. A sample of propane is burned at 59 degrees celsius and 746 mm Hg. The process produces 39.7 L of CO2(g). How much heat was released?
Photochemical chlorination of heptane gave a mixture of monochlorides containing 15% 1-chloroheptane. What other monochlorides are present? Estimate the percentage of each of these additioanl C7H15Cl isomers in a monochloride fraction.
Assuming no energy is transferred to or from the surroundings, calculate the final temperature of the water after all the ice melts.
How much dry solute would you take to prepare each of the following solutions from the dry solute and the solvent?
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