GLY_4200C_HW1_F11_KEY

GLY_4200C_HW1_F11_KEY - GLY 4200C Fall 2011 HOMEWORK...

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1 GLY 4200C HOMEWORK EXERCISE 1 KEY Fall 2011 Name SPECIFIC GRAVITY AND DENSITY Density is the mass per unit volume. In System International units, it is expressed as kilograms per cubic meter. The older style, and one still used by many mineralogists and geologists, is to express density as grams per cubic centimeter. Density may be calculated from mineral data as follows; D Z M N V where Z = # of formula units per unit cell M = molecular weight of the substance in question - these can be calculated using the table of atomic weights in the textbook N = Avogadro’s number 6.02338 x 10 23 V = volume of the unit cell, converted to appropriate units V is often given in Angstroms ( D ) or nm. One D = 10 -10 meters, while 1 nm = 10 -9 meters. To convert D 3 to cm 3 , it is necessary to multiply by (10 -8 ) 3 , or 10 -24 . To convert nm 3 to cm 3 , it is necessary to multiply by (10 -7 ) 3 , or 10 -21 . Unit cells are an expression of the three-dimensional lattices used to describe mineral structures. This topic will be developed more later in the course. Units cells have three
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