Consider a perfectly insulated and sealed container. Determine the minimum volum
ID: 1002094 • Letter: C
Question
Consider a perfectly insulated and sealed container. Determine the minimum volume of a container such that a gallon of water at 25 0C will evaporate completely. If the container is a cube, determine the dimensions in feet. Assume the density of the water is 0.998 g/cm3.
NaCl crystallizes in a face-centered cubic cell. What is the total number of ions (Na+ ions and Cl- ions) that lie within a unit cell of NaCl?
Argon has a cubic closest packed structure as a solid. Assuming that argon has a radius of 190 pm, calculate the density of solid argon.
Explanation / Answer
A.
Density = mass/volume
0.998g/cm3 = mass/3785.4cm3
mass = 3777.8 g
B.
The Structure of NaCl is Face Centred Cubic
14 Cl units and 13 Na units
Break-up is given below
8 Cl units in corner ---> 8*1/8=1
6 Cl units in face ---> 6*1/2=3 ====> Totally 4 Cl atoms
12 Na units in edge ---> 12*1/4=3
1 Na units in body ---> 1*1=1 ====> Totally 4 Na atoms
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