Monthly Archives: December 2013
How Much Energy is Released?
How much energy (in kilojoules) is released when 7.40g of water at 39.0∘C is cooled to -18.0∘C? The heat of fusion of water is 6.01 kJ/mol, and the molar heat capacity is 36.6 J/(K⋅mol) for ice and 75.3 J/(K⋅mol) for liquid water.
What is the Radius of a Tungsten atom?
The length of a unit-cell diagonal that passes through the center atom in tungsten is equal to 549 pm.
What is the radius (in picometers) of a tungsten atom?
What is the entropy of vaporization?
Naphthalene, better known as “mothballs,” has bp= 218∘C and ΔHvap = 43.3kJ/mol.
What is the entropy of vaporization, ΔSvap [in J/(K⋅mol)] for naphthalene?