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Write thermochemical equations, two ways, for each of the following situations.
a) When 1 mole of NH4Cl is dissolved in water, 25.0 kJ is lost by the water
b) When acetic acid is neutralized by sodium hydroxide, 76 kJ (per mole of acetic acid) of heat is released
consider a cup of coffee that has a temperature of 93oc. assume the mass of the coffee is 550 g and that the specific
if your lab partner added slightly too much water in step 5 of preparing the penny solution but then removed the
A solution is prepared by dissolving 0.2222 g of KIO3 in 50mL. Find the molarity and its uncertainty with an approximate number of significant figures
what are the respective concentrations m of fe3 and i- afforded by dissolving 0.200 mol fei3 in water and diluting to
a 4.50 gram sample of LiCl at 25.0 dissolves in 25.o ml of water also at 25.0 Celsius. the final equilibrium temperature of the resulting solution is 60.8 Celsius. what is the enthalpy of solution, delta Hs of LiCl expressed in kilojoules per mole..
stock soultions of thris base and tris acid how much of each would you use to make 100ml
What is delta H rxn/mol Mg for the following reaction. Mg + 2HCl -> MgCl2 + H2 if 0.158 g Mg reacts in 100.0 mL of solution and changes the temperature from 25.6 °C to 32.8 °C
Determine the minimum excitation energy of an electron constrained to rotate in a circle of radius equal to the Bohr radius (the value of Bohr predicts for the electron-hydrogen distance in the n=1 state) around a fixed point.
Consider the data below representing a run for the Clock Reaction. If the volumes of reagents indicated were combined and 219 seconds elapse before the color appears, calculate the rate of reaction in M/s.
You need to produce a buffer solution that has a pH of 5.03. You already have a solution that contains 10. mmol of acetic acid. How many millimoles of acetate will you need to add to this solution. The pKa of acetic acid is 4.74. Express your answe..
A sample of 2.376 g ether (The compound known as diethyl ether [(C2H5)2O], commonly referred to as ether, contains carbon, hydrogen, and oxygen) was combusted in an oxygen rich environment to produce 2.887 g of H2O (g) and 5.643 g of CO2 (g).
On a dry day, your body can accumulate static charge from walking across a carpet or from brushing your hair. If your body develops a charge of -14 (microcoulombs), how many excess electrons has it acquired
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