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Combustion and Metal Reactions

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14. The gaseous hydrocarbon acetylene, C2H2, is used in welders' torches because of the large amount of heat released when acetylene burns with oxygen, producing carbon dioxide and water. First, write a balanced equation for the combustion of acetylene in oxygen. Then, how many grams of acetylene are needed for the complete combustion of 750 grams of oxygen? How many carbon dioxide molecules are formed in this reaction?

15. Many metals occur naturally as sulfide compounds, including CuS and CoS. Air pollution often accompanies the processing of these ores, because toxic sulfur dioxide is released as the ore is converted from the sulfide to the oxide by smelting. Consider the reaction of zinc sulfide with oxygen to form zinc oxide and sulfur dioxide. First, write a balanced equation for this reaction. Then, how many kilograms of zinc sulfide are reacted when 250 kilograms sulfur dioxide of is produced by this process? How many kilomoles of oxygen are used up?

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This solution provides step by step calculations for calculating the amount of molecules needed in a reaction.

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