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When liquid water at 0°C and 1 atm is converted to ice at 0°C and 1 atm, 6.01 kJ mol-1 of energy is released as heat to the surroundings. Calculate the change of entropy for the water, ΔSwater , and for the surroundings, ΔSsur , when 1.00 mole of water freezes at 0°C and the surroundings are at (a) 0°C, (b) -2°C. Explain the physical origin of the difference.
draw the valid lewis structures of polyatomic ions in bro4-. determine the number of resonance forms for each structure
In a reaction 82.00 g of sodium reacts with 74.00g of ferric oxide to form sodium oxide and iron metal. calculate the mass of solid iron produced
Calculate the Ksp for zinc phosphate if 1.18 10-4 g of zinc phosphate dissolved to make 5.0 L of a saturated solution.
Find the Ksp range for PbI2(s) (hint: you will need to apply the dilution formula to the concentration of Pb(NO3)2 and KI. Think about what you will need to find the Ksp and look for those pieces of information in the video.
hot methanol and then stored the recrystallization solution until the next lab period. What possible effect on your results due to this experimental error could take place?
The reaction of aniline with benzaldehyde affords a diphenyl imine. Sketch the reaction showing the product and outline a mechanism
2noclg rarr 2nog cl2gat 450 k the rate constant is 15.4 atm-1s-1. how much time in s is needed for nocl originally at
ichromate solution is 0.0189 M dichromate, and it took 26.01 mL of your standard iron solution to titrate the excess dichromate in an unknown. What is the chemical oxygen demand of the sample, in units of mg O2/L?
Once the liquid has solidified, the system is in thermal equilibrium (no temperature change in the solid). What is the latent heat of fusion (kJ/kg) of the unknown liquid?
What is the pH of a soft drink in which the major buffer ingredients are 6.6 g of NaH2 PO4 and 8.0 g of Na2HPO4 per 355 mL of solution
when the cations Na+ K+ Cs+ are combined with chloride ion in the gas phase to form ion pairs, which pair formation releases the greatest amount of energy? KCL or RbCl, or NaCl or CsCl.
a solution of 100 ml of .200 M KOH is mixed with a solution of 200 ml of .150 M NiSO4. what is the chemical equation, what precipitate forms, what is the limiting reagent, and how many grams of the precipitate form?
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