For C3H6O, carbon will have the highest mass percent. Cobalt is a ferromagnetic metal with a specific gravity of 8.9. Sie können Ihre Einstellungen jederzeit ändern. During discharge,[clarification needed] the lithium is released as lithium ions. Subsequent roasting converts the ores to cobalt sulfate, and the copper and the iron are oxidized to the oxide. = Percent Composition: Total mass of compound (Whole) Example 1. Since there is only one Sr in every compound, the mass will be the same: 87.62g/mol Sr Now divide the molar mass of Sr by each of compounds' masses: For a question like this you can actually just 'eyeball' it. MeB12 promotes methyl (−CH3) group transfers. 1)BaS 2)CaS 3)MgS 4)SrS 15.Which compound has the greatest percent composition by mass of sulfur? [80], In February 2018, global asset management firm AllianceBernstein defined the DRC as economically "the Saudi Arabia of the electric vehicle age," due to its cobalt resources, as essential to the lithium-ion batteries that drive electric vehicles. It produced an estimated one-third of the total global cobalt production in 2008. Artisanal mining supplied 17% to 40% of the DRC production. High levels of Co and Se have been recorded in seafood sourced from coastal areas with higher levels of the trace metals. 8H2O) and spherocobaltite (CoCO3). What carbon compounds have the highest percentage of carbon by mass (or volume)? [91] Some high-speed steels also contain cobalt for increased heat and wear resistance. Damit Verizon Media und unsere Partner Ihre personenbezogenen Daten verarbeiten können, wählen Sie bitte 'Ich stimme zu.' Use the following equation to determine the mass percent of in each compound. A minimal presence of cobalt in soils therefore markedly improves the health of grazing animals, and an uptake of 0.20 mg/kg a day is recommended because they have no other source of vitamin B12. Most coastal toxicity levels are influenced by anthropogenic input like sewage runoff and burning of fossil fuels. 69.58%. ... that I might consider in its place. • Mass percent can be used to determine a compound’s empirical formula, but not its molecular formula. The adenosyl version of B12 catalyzes rearrangements in which a hydrogen atom is directly transferred between two adjacent atoms with concomitant exchange of the second substituent, X, which may be a carbon atom with substituents, an oxygen atom of an alcohol, or an amine. hide. Question: What is the mass percentage of oxygen in Fe2O3? This step-by-step tutorial will show the method to determine the mass percent composition of … Find the molecular mass of the entire compound. 1) HCl 2)KCl 3) LiCl 4) NaCl 2)Which compound has the smallest percent [146][147], Furthermore, cobalt metal is suspected of causing cancer (i.e., possibly carcinogenic, IARC Group 2B) as per the International Agency for Research on Cancer (IARC) Monographs. [92] It is also alloyed with 95% platinum for jewelry, yielding an alloy suitable for fine casting, which is also slightly magnetic. share. In 1966, the addition of cobalt compounds to stabilize beer foam in Canada led to a peculiar form of toxin-induced cardiomyopathy, which came to be known as beer drinker's cardiomyopathy. Therefore, the percent by mass of nitrogen in ammonium nitrate is: 100[(2)(14.0067)/80.04] or 35.00 %, to the justified number of significant digits. The lack of safety precautions frequently causes injuries or death. [127][128], Nuclear weapon designs could intentionally incorporate 59Co, some of which would be activated in a nuclear explosion to produce 60Co. Anthropogenic input contributes as a non-natural source but in very low amounts. It was discovered that the volcanic soils lacked the cobalt salts essential for the cattle food chain. The main ores of cobalt are cobaltite, erythrite, glaucodot and skutterudite (see above), but most cobalt is obtained by reducing the cobalt by-products of nickel and copper mining and smelting. a) CO. For the given compound both elements are present in 1:1 ratio so the element which has higher atomic weight has the higher mass % composition, So O has higher mass % composition for the given compound. Typical catalysts are the cobalt carboxylates (known as cobalt soaps). [81], On March 9, 2018, President Joseph Kabila updated the 2002 mining code, increasing royalty charges and declaring cobalt and coltan "strategic metals". [84], In December 2019, International Rights Advocates, a human rights NGO, filed a landmark lawsuit against Apple, Tesla, Dell, Microsoft and Google company Alphabet for "knowingly benefiting from and aiding and abetting the cruel and brutal use of young children" in mining cobalt. Kshitij G answered on June 06, 2015. Disclaimer: I'm going to estimate all my masses. [54] In the deep ocean, cobalt sources are found lying on top of seamounts (which can be large or small) where ocean currents sweep the ocean floor to clear sediment over the span of millions of years allowing them to form as ferromanganese crusts. You're looking at a percentage of oxygen by weight so you need (weight of oxygen)/(weight of compound) x 100% One oxygen is about 16 g/mol. This market share may reach 73% by 2025 if planned expansions by mining producers like Glencore Plc take place as expected. Recent growth in production could at least partly be due to how low mining production fell during DRC Congo's very violent civil wars in the early 2000s, or to the changes the country made to its Mining Code in 2002 to encourage foreign and multinational investment and which did bring in a number of investors, including Glencore. Cobalt-57 is used as a source in Mössbauer spectroscopy and is one of several possible sources in X-ray fluorescence devices. Before the 19th century, cobalt was predominantly used as a pigment. Cobalt is a trace metal involved in photosynthesis and nitrogen fixation detected in most ocean basins and is a limiting micronutrient for phytoplankton and cyanobacteria. [70][75] This revelation prompted cell phone maker Apple Inc., on March 3, 2017, to stop buying ore from suppliers such as Zhejiang Huayou Cobalt who source from artisanal mines in the DRC, and begin using only suppliers that are verified to meet its workplace standards. It causes respiratory problems when inhaled. Dies geschieht in Ihren Datenschutzeinstellungen. This instability affected the price of cobalt and also created perverse incentives for the combatants in the First and Second Congo Wars to prolong the fighting, since access to diamond mines and other valuable resources helped to finance their military goals—which frequently amounted to genocide—and also enriched the fighters themselves. While DR Congo has in the 2010s not recently been invaded by neighboring military forces, some of the richest mineral deposits adjoin areas where Tutsis and Hutus still frequently clash, unrest continues although on a smaller scale and refugees still flee outbreaks of violence.[78]. Some examples of carbon by mass the adhesion between steel and rubber in radial! Therefore has the highest mass percent of that component less common than other metalloproteins ( e.g is as. 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