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October 26, 2014

Posts by jaycab


Total # Posts: 11

chemistry
50J of energy is transferred as work is done on the system. 30J of heat is also absorbed by the system. Calculate the change in internal energy.
January 23, 2011

chemistry
A system performs 120J work with no heat supplied to it. Calculate the change in internal energy of the system.
January 23, 2011

chemistry
Calculate the change in internal energy of the system in a process for which 100J of heat is absorbed by the system from surroundings and does 85J of work. (I want to learn the solution on how to calculate it... pls. help thank you... )
January 23, 2011

chemistry
A man consumes 50,000J of heat in doing his work out activities. A serving of his food provides him with 25,000J of energy. Interpret the energy values in terms of first law of thermodynamics.
January 23, 2011

chemistry
Weak Acid 1.) The pH of a 0.060M weak monoprotic acid HA is 3.44. Calculate the Ka of the acid. 2.) The pH of 0.100M solution of weak monoprotic acid HA is 2.85. What is the Ka of the acid?
January 20, 2011

chemistry
Weak Acid 1.) The pH of a 0.060M weak monoprotic acid HA is 3.44. Calculate the Ka of the acid. 2.) The pH of 0.100M solution of weak monoprotic acid HA is 2.85. What is the Ka of the acid?
January 20, 2011

chemistry
SALT HYDROLYSIS 1.) Calculate the pH of a 0.24M sodium formate (HCOONa) solution. Kb=5.9x10^-11. 2.) Calculate the pH of 0.25M pyridium chloride (C5H5NHCl)solution. Ka=5.9x10^6.
January 20, 2011

chemistry
COMMON ION EFFECT 1.) What is the pH of a solution that is 0.30M in HCOOH and 0.52M in HCOOK. Ka of HCOOH=1.7x10^-4. 2.) Calculate the pH of a buffer system containing 1.0M CH3COOH and 1.0M CH3COONa. Ka of CH3COOH=1.8x10^-5.
January 20, 2011

chemistry
A. Strong Base 1.) What is the concentration of a solution of KOH for which the pH is 11.89? 2.) What is the pH of a 0.011M solution of Ca(OH)2? B. Weak Acid 1.) The pH of a 0.060M weak monoprotic acid HA is 3.44. Calculate the Ka of the acid. 2.) The pH of 0.100M solution of ...
January 20, 2011

chemistry
A solution formed by dissolving an antacid tablet has a pH of 9.18. Calculate [H+].
January 20, 2011

chemistry
a sample of freshly pressed apple juice has a pH of 3.76. Calculate [H+].
January 20, 2011

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