In the course of the combustion analysis of an unknown compound containing only carbon, hydrogen, and nitrogen, 12.923 g of carbon dioxide and 6.608 g of water were measured. 2.What is being varied between each test tube/trial? Explain. + 10H+ 13O 2 C 4 H 10 2 8CO 2 2 O a. Look at the balanced equation. The combustion of a sample of butane, C 4 H 10 (lighter fluid), produced 2.46 grams of water. 3. 1. From there other hydrocarbons can form. Acetylene is a hydrocarbon also known as ethyne (C 2 H 2). It is a gas often used in welding. (Use grams moles) 2.46 g H2O × 1 mol H2O In this lab, we will be determining the ratio of acetylene to oxygen that gives complete combustion. 3. 4 CO2 + 2 H2O. 2. In the reaction 2 H2C2 + 5 O2 ? Combustion of Acetylene Reaction of Calcium Carbide with Water Continued on page 2 Introduction Use this demonstration at the start of the school year or in your unit on chemical reactions. For this assignment, we will look more closely at the chemical reactions involved in terms of the limiting reactant and percent yield in this analysis. UNIT 9 STOICHIOMETRY / 9.3 LIMITING REACTANT AND PERCENT YIELD 9.3 Combustion of Acetylene lab Analysis Assignment In this lesson we watched a laboratory demonstration video showing the production and combustion of ethene (acetylene) gas. 2C2H2(l) + 5O2(g) mc001-1.jpg 4CO2(g) + 2H2O(g) If the acetylene tank contains 37.0 mol of C2H2 and the oxygen tank contains 81.0 mol of O2, what is the limiting reactant for this reaction? Note the coefficients of the reactants. Write the balanced equation for the combustion of acetylene. The acetylene in this lab will be collected in a test tube and burned. The complete combustion of 11.014 g of the compound needed 10.573 g of oxygen. What proportion of oxygen molecules to acetylene molecules are required for the most effective burning of acetylene… 3. Explain. We filled multiple test tubes with acetylene gas at different levels, and then put flame near it to make a combustion reaction. In our lab, we made a combustion reaction using acetylene. This is probably not a complete answer, but it must be noted that under compression acetylene can undergo an exothermic dimerizattion to form vinylacetylene. The acetylene in this lab will be collected in a test tube and burned. Consider the combustion reaction for acetylene. The balanced equation for the combustion of acetylene is 2 H2C2 + 5 O2 ? 5.Would you expect acetylene (ethyne) to react with bromine with or without exposure to light? The safe, controlled explosion gives you the opportunity to answer “Yes” to a question that Calcium chemistry students often ask, “Are we In this lab we will produce acetylene by placing calcium carbide (CaC2) in water. Repeat steps 1 to 8 for each of the other two amounts of acetylene. We need to write a balanced eqn for each situation. Complete combustion reactions are known to form carbon dioxide and water as products. Explain. F. Acetylene (Ethyne) Mixture Observations Tube 1 Tube 2 Tube 3 Tube 4 Table 4: Results - Acetylene 1.What is required to be present in order for combustion to occur? Treatment of the nitrogen with H 2 gas resulted in 2.501 g NH 3. A combustion reaction occurs when a compound merges with oxygen to release heat in an exothermic reaction. How many moles of water are produced? Neglect of this possibility might lead to errors in the analysis. Write the chemical formula for the reaction between calcium carbide and water knowing that the product is acetylene (C2H2). Write the balanced equation for the combustion of acetylene. 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