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Calculate DE, and determine whether the process is endothermic or exothermic for the following cases: A system releases 43 kJ of heat to the surroundings and has 665 kJ of work done on it by the surro
Based on activation energies and energy changes and assuming that all collision factors are the same, answer the following questions- Which of the following reactions would be fastest in the forward
A reaction takes place inside a constant volume or BOMB calorimeter. Pressure is not constant during the reaction. The heat absorbed by the calorimeter is measured to be +15J.
A sample of ammonia gas is completely decomposed to nitrogen andhydrogen gases over heated iron wool. If the total pressure is 603mmHg, calculate the partial pressure of N2 and H2
A reaction takes place inside a constant pressure calorimeter. The heat absorbed by the calorimeter is measured to be +15J.
Which of the following reactions is the formation reaction for CH3OH(l)
Consider a glass of 218 mL of water at 30°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
Suppose it is found that the actual molecular mass of your unknown solid is exactly two times larger than that which you determined experimentally. What could you conclude about the nature of your u
calculate the partial pressure of each gas in atm. PN2 PO2 PAr PCO2 Calculate the concentration of each gas in moles per liter at 0 degrees C cN2 cO2 cAr cCO2 (enter answer in scientific notation fo
Describe the preparation of 1 liter of a 0.75M acetate buffer, pH 4.50, starting from a 1.50 M solution of acetic acid and solid KOH pellets, M.W.=56 (pKa=4.75)
You identified your unknown compound. How you could use this compound to determine the Kf value for ethyl alcohol? Explain what you would do experimentally.
what is the resulting pH when mixing 200.0mL solution of 0.50 N HCl (strong acid) with 300.0mL solution of 0.45 M KOH (string base)
The equilibrium membrane potential for the case of multiple ions will depend not only on the concentrations of the ions within and outside the cell, but also on the permeability of the cell membrane
To obtain a 18.0% (w/v) solution of copper sulfate (CuSO4), M.W.=160 when only the crystalline salt is available (CuSO4 5H2O, M.W.=250), what should the crystalline salt be weighed to prepare 450.0m
How many potassium ions must a cell lose in order to produce a membrane potential of - 95 mV for potassium? How does this compare to the number of potassium ions within the cell
You are concentrating a solution containing a polypeptide of modest molecular weight by pressure filtration through a membrane. The solute concentration on the feed side of the membrane is 0.10 M an
Draw the structure of an alkane or cycloalkane that has more than three but fewer than ten carbon atoms, and only primary hydrogens.
The membrane has pores equivalent in size to a spherical molecule with a molecular weight (Mm) of 120,000 daltons. The protein solution consists of albumin (40 g/L at Mm = 69,000 daltons), globulins
Draw the structure of an alkane or cycloalkane that has five carbon atoms and only secondary hydrogen atoms.
2Al(s)+2KOH(aq)+6H2)-->2KAl(OH)4(aq)+3H2(g) If you place 2.05 g of aluminum in a beaker with 185 ml of 1.35 M KOH, will any aluminum reamin. What mass of KAl(OH)4 will be produced
Phosphate buffer has 3 ionizable groups, with pKa's of 2.15, 7.2, and 12.45. A 1.20 M solution of this buffer (250 mL) is found to have a pH of 6.0. A biochemist adds 30 mL of 1.0 M NaOH to this buf
A blast furnace is the main unit in the production of iron from iron ore. One can view the blast furnace as a process in which the principal desired reaction is:
A 31.0 sample of an unknown H3PO4 solution is tritrated with a 0.120M NaOH solution. The equivalence point is reached when 26.43 mL of NaOH solution is added. What is the concentration of the unknow