The gemstone tanzanite was first discovered in Tanzania in 1967. Like other gemstones, it contains impurities that give it distinct characteristics, but it is primarily Ca2Al3Si3O12(OH). The largest tanzanite stone ever found contains about 0.0555 mole of Ca2Al3Si3O12(OH). What is the mass of this stone in kilograms?
118. The gemstone tanzanite was first discovered in Tanzania in 1967. Like other gemstones, it contains impurities that give it distinct characteristics, but it is primarily Ca2Al3Si3O12(OH). The largest tanzanite stone ever found contains about 0.0555 mole of Ca2Al3Si3O12(OH). What is the mass of this stone in kilograms?
130. Agent Orange, which was used as a defoliant in the Vietnam War, contained
a mixture of two herbicides called 2,4,5-T and 2,4-D. (Agent Orange got its name from the orange barrels in which it was stored.) Some of the controversy that surrounds the use of Agent Orange is related to the discovery in 2,4,5-T of a trace impurity called TCDD. Although recent studies suggest that it is much more harmful to animals than to humans, TCDD has been called the most toxic small molecule known, and all uses of 2,4,5-T were banned in 1985. TCDD is 44.77% carbon, 1.25% hydrogen, 9.94% oxygen, and 44.04% chlorine and has a molecular mass of 321.97. What is the molecular formula for TCDD?
140. Chromium metal is used in metal alloys and as a surface plating on
other metals to minimize corrosion. It can be obtained by reducing the chromium(III) in chromium(III) oxide, Cr2O3, to the uncharged metal with finely divided aluminum. The Cr2O3 is found in an ore called chromite. What is the maximum mass, in kilograms, of chromium that can be made from 143.0 metric tons of Cuban chromite ore that is 38% Cr2O3?
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