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Gallium arsenide (GaAs) has the zinc blende structure. The gallium atoms are in FCC packing and the arsenic atoms occupy half the tetrahedral sites. Calculate the density of Gallium arsenide (GaAs) using the following data.
Covalent Radius Ga 1.26 Ångstroms As 1.19 Ångstroms
Atomic Mass Ga:69.7 g/mole As: 74.9 g/mole
Avogadro's number (NAv) is 6.02 x 10^23 atoms per mole.
The heat of vaporization of CCl2F2 is 289 J/g. What mass of this substance must evaporate in order to freeze 180g of water initially at 25 C? The heat of fusion of water is 334 J/g; the specific heat of water is 4.18 J/gK.
From a consideration of the Lewis structure of the thiocyanate ion, SCN-, in which carbon has a double bond with both the sulfur and nitrogen atoms, the formal charges on the sulfur, carbon, and nitrogen atoms are, respectively,
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