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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 molecules of acetylene (HCCH) react with 123 molecules of oxygen to produce carbon dioxide and water.
Zinc has two isotopes. Zn-64 has an atomic mass of 63.9292amu and Zn-72 has an atomic mass of 71.9278amu. Its average atomic mass is 65.38amu. Calculate the abundance, in percent, of Zn-64.
Given the pK for acetic acid is 4.76. Suppose that we dissolve a mole of this weak acid in 10L of water. Find the pH of the resulting solution.
Hydrazine, ammonia, and hydrogen azide all contain only nitrogen and hydrogen. The mass of hydrogen that combines with 1.00g of nitrogen for each compound is .144, .216, and .240, respectively.
Solubility Constant, Ksp of Reactant, The chemical reaction representing the soluability of AGBr is: AgBr (right and left arrow) Ag^+ +Br^-
If the formula for magnesium fluoride is MgF 2 and the formula for potassium chlorate is KClO 3 , then what is the formula for magnesium chlorate?
What mass of iron is needed in order to supply the energy needed to warm 15.0mL of water (d= 1.00 g/cm3) from 23C to 37C
Compute the final x value using quadratic formula If two moles of caron mono oxide gas and one mole of chlorine gas are placed in the vessel and heated to 500 Kelvin temperature to start the reaction?
You have a solution of sodium nitrate containing 140g at 65 degrees Celsius. Is the solution saturated, unsaturated, or supersaturated.
An expanding gas does 150.0 J of work on its surroundings at a constant pressure of 1.01 atm. If the gas initially occupied 68.0 mL, what is the final volume of the gas.
What is the solubility in moles/liter for copper(II) iodate at 25 oC given a Ksp value of 1.4 x 10-7. Write using scientific notation and use 1 or 2 decimal places (even though this is strictly incorrect!).
Carbonyl fluoride, COF2 is an important intermediate used in the production of fluorine-containing compounds. For instance, it is used to make the refrigerant carbon tetrafluoride
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