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The conductance of an aqueous solution of trans-[Co(en)2Cl2]Cl changes on standing overnight. Would you expect it to incease or decrease. Why
Powdered coal ( essentially pure C ) is reacted with excess water to make a mixture of CO,CO2 and H2 The reaction is desired reaction ,CO2 is an undesired waste product. This gas mixture from the re
Calculate the change in enthalpy of HCl + NaOH--> NaCl + H2O for this reaction using Hess's Law. Units should be kJ/mol.
Use the Henderson-Hasselbalch equation to calculate the PH of each solution- a solution that contains 0.760% C5H5N by mass and 0.960% C5H5NHCl by mass
Solve an equilibrium problem (using an ICE table) to calculate the pH of each of the following solutions. 0.17 M CH3NH2Cl
HClO is a weak acid (Ka = 4.0 × 10-8) and so the salt NaClO acts as a weak base. What is the pH of a solution that is 0.031 M in NaClO
The value of Ksp for silver sulfide, Ag2S , is 8.0x10^-51 . Calculate the solubility of Ag2S in grams per liter. If you could, can you tell me how u did them
Bromothymol blue, ka = 1.6 x 10^-7, is yellow in its protonated form (HX) and blue in its ionized form (X-). At what PH will bromothymol blue be a perfect green color
NH3 is a weak base (Kb = 1.8 × 10-5) and so the salt NH4Cl acts as a weak acid. What is the pH of a solution that is 0.041 M in NH4Cl
Why is it an important concept that atoms generally appear in whole number molar ratios to each other in chemical compounds, and in general, would you expect that students would find this ratio to b
Enough of a monoprotic acid is dissolved in water to produce a 0.0166 M solution. The pH of the resulting solution is 2.38. Calculate the Ka for the acid.
How does the experimental empirical formula of hydrated alum compare to the actual empirical formula. Make sure to list your reference for the actual empirical formula of hydrated alum.
A Breathalyzer instrument contains two ampules, each of which contains 0.75 mg K2Cr2O7 dissolved in 3 mL of 9 mol L^-1 H2SO4(aq). One of the ampules is used as reference. When a person exhales into
If the heat capacity of the calorimeter was 25 J/C, what would the change in enthalpy (delta H rxn) for this reaction be
What are the concentrations of OH- and H in a 0.00054 M solution of Ba(OH)2 at 25 °C? Assume complete dissociation.
Which compound is the limiting reagent for this reaction. Calculate the change in enthalpy (delta H rxn) per mole of limiting reagent for this reaction.
What is the final temperature in a squeezed cold pack that contains 40.0 g of NH4NO3 dissolved in 135 mL of water? Assume a specific heat of 4.18 J/(g·°C) for the solution, an initial tem
Consider a glass of 167 mL of water at 29°C. Calculate the mass of ice at -15°C that must be added to cool the water to 10°C after thermal equilibrium is achieved. To find the mass of wa
Calculate [H3O ], [ClO4-], and [OH-] in an aqueous solution that is 0.110 M in HClO4(aq) at 25 °C. is the solution acidic, basic, or neutral
Given that Kw for water is 2.4× 10-14 at 37 °C, compute the pH of a neutral aqueous solution at 37 °C, which is the normal human body temperature.
When a 0.6333-g sample of a compound of carbon, hydrogen and sulfur was burned in excess oxygen, 0.9272 g CO2, 0.3795 g H2O and 0.6749 g SO2 were obtained. In a separate experiment, it was found tha
In a separate experiment, it was found that, for fixed temperature and pressure, a 0.100 L sample of this compound takes 1.73 times longer to effuse than does a 0.100 L sample of Ar(g). What is the
In a second experiment, a 1.217 g sample of a compound with the formula C6H14O(l) was burned in the same calorimeter. The temperature increased by 10.08 oC. Use these data, plus the information give
Calculate the % atom economy for the following two methods for converting benzene, C6H6, to aniline, C6H5NH2.