7e- ^ the 13 on C is mass number. = # protons + # neutrons. 3. N2 + 2 O2 + Cl2 -> 2 NO2 Start with 6 mol N2‚ 4 mol O2‚ 4 mol Cl2‚ Find limiting reagent and amounts remaining of excess reactants N2 + 2 O2 + Cl 2 6 mol 4 mol 4 mol start Max yield x (2mol No‚Cl/ 1 mol N2) Of No2Cl = 12 mol 4 mol 8 mol O2 is the limiting reagent. 4 mol of NO2Cl (4 mol NO2Cl) (1 mol N2 / 2mol No2Cl) = 2 mol N2 consumed 6 mol N2 – 2 mol N2 = 4 mol N2 left ^at start ^ used up (4 mol NO2Cl) (1 mol
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0.7856 H2SO4 98.06 ~15drops N/A N/A N/A 327 1.84 Methanol 32.0 ~6mL N/A N/A N/A 64.7 0.7914 Water 18.0 5mL N/A N/A 0 100 1.0 1‚4-Di-t-butyl-2‚5-dimethoxybenzene 250.17 product product 1:1 102-105 N/A N/A Reaction and its Mechanism: The limiting reagent for this reaction is 1‚ 4 – dimethoxybenzene. See calculations section for explanation. Overall Reaction: C8H10O2+
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Cited: "Limiting and Excess Reagents - Practice Problems." Limiting and Excess Reagents - Practice Problems. N.p.‚ n.d. Web. 22 Apr. 2013.
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Food Fermentation Microbiology sasimalani@msu.edu.my INTRODUCTION • Industrial microbiology uses microorganisms‚ typically grown on a large scale‚ to produce valuable commercial products or to carry out important chemical transformations. • This process is commonly referred to as Fermentation DEFINITION OF FERMENTATION “The process of deriving energy from the oxidation of organic compounds‚ such as carbohydrates‚ using an endogenous electron acceptor‚ which is usually an organic
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flames‚ and sharp objects that can cause damage if used improperly. The following precautions should be taken to avoid the problems that could potentially occur. 1. Lab coats are required. Wearing old clothing is also desirable‚ since many reagents can produce permanent stains on clothes. 2. Students may not wear sandals or open toed or canvas shoes because of the constant danger of cuts and infections from broken glass found on the lab floors and the possibility of chemical spills. 3. Long
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225 g Moles of Ferrocene 1.21 * 10 ^ -3 mol Initial volume of acetic anhydride 1.00 mL Moles of acetic anhydride 0.0110 mol Initial volume of phosphoric acid 0.300 mL Initial moles of phosphoric acid 5.15*10^-3 mol Limiting reagent Ferrocene Moles of limiting reagent 1.21*10^-3 mol Final weight of product 0.288g Theoretical yield 29.49 Moles of product 3.73*10^-4 mol % yield 97% melting point (°C) of product 128°C -131°C Calculations: Moles of Ferrocene 0.225g * mol of ferrocene/186
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crystal was weighed. The melting point range of the recrystallized tin tetraiodide was measured using a MEL-TEMP. Instruments should be washed by acetone during the experimental. Result Table 1 contains the molar mass‚ mass and the moles of reagents (Sn and I2) and products (crude SnI4‚ recrystallized SnI4 and air-dry SnI4). The yields of product and percent recover of
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Title: Finding the Ratio of Mole of Reactants in a Chemical Reaction Purpose of Lab: To find the coefficients of two chemical reactants that appears in a balanced chemical equation using the continuous variations method. Pre Lab Questions: 1. 2AgNO3(aq) + K2CrO4(aq) → 2KNO3(aq) + Ag2CrO4(s) 2. There is enough to make a valid conclusion because‚ on the graph‚ one can clearly see that the two lines intersect. Thus‚ one can also determine the mole ratio. The mole ratio is approximately
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(important details) How can the rxn be activated Second step: rxn of the Grignard reagent with acetophenone‚ quenching with ammonium chloride Isolation of the product‚ identification Possible or actual sources of error Part one of our experiment consisted of the preparation of phenylmagnesium bromide from bromobenzene. PhMgBr is an organometallic reagent‚ a class of nucleophile known as a Grignard reagent. Gringard reagents are a class of extremely reactive chemical compounds used in the synthesis of
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interest. If it is desired to measure either organic or inorganic COD alone‚ additional steps not described here must be taken to distinguish one from the other. COD is a defined test; the extent of sample oxidation can be affected by digestion time‚ reagent strength‚ and sample COD concentration. COD often is used as a measurement of pollutants in wastewater and natural waters. Other related analytical values are biochemical oxygen demand (BOD)‚ total organic carbon (TOC)‚ and total oxygen demand (TOD)
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