6120

Chemistry Mole Concept Level: Misc Level

A sample of aluminum of mass 1.25 kg is cooled at constant pressure from 300K to 26K.Calculate the energy that must be removed as heat and the change in entrpy of the sample. The molar heat capacity of aluminum is 24.35 J/K mol.


6101

Chemistry Mole Concept Level: Misc Level

Compute the molarity of 15.0 mI of nitric acid solution that required 35.9 mI of 0.0480 M KOH for complete neutralization.


5399

Chemistry Mole Concept Level: Misc Level

What is the molar solubility of PbBr2 in a 0.10. M solution of Pb (NO3)2 ?


5348

Chemistry Mole Concept Level: Misc Level

Estimate the molecular weight of a polymer if a 100 mL solution of 6.5 g of polymer in toluene has osmotic pressure of 0.044 atm at 27 degree celcius.


4903

Chemistry Mole Concept Level: Misc Level

Calculate the number of moles of the positive ions present in 9.71 g of barium phosphide, Ba3 P2


4901

Chemistry Mole Concept Level: Misc Level

Calculate the number of molecules in 4.75 millimol of phosphine


4816

Chemistry Mole Concept Level: Misc Level

Calculate the total heat required to melt 100 g of ice at 0 degrees C, heat it to 100 degrees C, and then vaporize it at that temperature. (water std enthalpy of vap = 40.7 kJ /mol)


4776

Chemistry Mole Concept Level: Misc Level

When 3.0 mole Oxygen gas is heated at a constant pressure of 3.25 atm, its temperature increases from 260 K to 285 K. Given that the molar heat capacity of Oxygen at constant pressure is 29.4 J/K mole. Calculate the q (energy), delta H (enthalpy )and the delta U (internal energy ).


4774

Chemistry Mole Concept Level: Misc Level

When 229 J of energy is supplied as heat to 3.00 mol Ar (g), the temperature of the sample increases by 2.55 K. Calculate the molar heat capacities at constant volume and constant pressure of the gas.


4676

Chemistry Mole Concept Level: Misc Level

Assume that there are 6.02 *10 to the power of 23 atoms of aluminum in 27.0 grams of Al metal.One empty aluminum can weighs 13.8 grams. If you have two dozen empty Al cans, how many atoms of Al would you have?Show setup with units.


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