Processing of Uncertainties | No of moles of Mg in reaction= 0.12524.31= 0.00514 mol (to 3sf)No of moles of Oxygen in reaction= 0.04216.00= 0.00263 mol (to 3sf)No of moles of Mg : No of moles of O= 2:1 ∴ Empirical formula of the compound = Mg2O | Percentage Uncertainty of No of moles of Mg in reaction= 0.0020.125 ×100%= 1.60% (to 3sf)Absolute uncertainty of No of moles of Mg in reaction= 0.00514 × 1.60100= 0.00008 mol (to 5dp)Percentage Uncertainty of No of moles of O in reaction= 100% × 0.0050.042=
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the number of moles of HCl reacted with the NaOH is 0.00216 moles‚ which is less than Gaviscon. The number of moles of NaOH that were added from the burette is 0.00327 moles (1 tablet of Gaviscon). However‚ for Quick-eze‚ the number of moles is 0.00216 moles (1 tablet). This means the average volume of the NaOH have affected the number of moles as the concentration of the sodium hydroxide is 0.1M. This means that if less NaOH was required to neutralise the acid‚ the number of moles of HCl neutralized
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Thermochemistry Lab #2 - Heat of Reaction - Hess’s Law Return The foundation of the study of thermochemistry was laid by the chemist Germain Hess‚ who investigated heat in chemical reactions during the last century. One statement of the law that bears Hess’s name says: The enthalpy change for any reaction depends on the products and reactants and is independent of the pathway or the number of steps between the reactant and product. In this experiment‚ you will measure and compare
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has made me a stronger person. Losing someone you once cared for shouldn’t be seen negatively‚ it should be looked positively. This friendship I had was very special because I never had a close friend who I could tell everything to. His name was Adrian and we had been friends for four years. I considered that guy as my brother‚ I looked up to him all the time‚ and our friendship was very special that no one understood it. Sadly‚ one day in tenth grade a huge argument occurred that ruined our friendship
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Teresa Meng‚ Niharika Palakodety‚ Victoria Wang‚ and Grace Xiong Mrs. Rhonda Smith Honors Chemistry Period 4 13 May 2012 Redox Reactions Lab Report We wished to investigate the oxidation number of a metal that would form aqueous ions when reacted with an aqueous nitrate salt. For this purpose‚ we chose to investigate the reaction of solid copper metal‚ in the form of a wire‚ with aqueous silver nitrate. Before we began the lab‚ we hypothesized that when silver nitrate‚ AgNO3‚ reacts with
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Compleximetric Determination of Water Hardness Caindec‚ Patricia Ysabel B. Water hardness is a measure of the amount of calcium and magnesium carbonate dissolved as Ca 2+ and Mg 2+ in water. There are no health hazards associated with water hardness‚ however‚ it causes scaling‚ as well as forming of soap suds. Compleximetric titration is one of the best ways of measuring total water hardness using a standard ethylenediaminetetraacetic acid (EDTA) solution. EDTA solution is used as it has the
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NaOH(aq) Equation: C6H4COOH.COOK + NAOH → C6H4COOK.COONa Ratio of Reactants: 1 : 1 1 mole of Potassium Hydrogen Phthalate (C6H4COOH.COOK) reacts with 1 mole of Sodium Hydroxide (NAOH). Concentration of NaOH = Weight of Potassium Hydrogen Phthalate Volume of NaOH (dm3) × Molar Mass of Potassium
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this experiment is to determine the atomic mass of each metal and the percent composition of a known mass aluminum-zinc alloy by determining the moles of H2 gas formed. Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g) 1 mole of H2(g) is produced for every 1 mole of Zn(s) 2. 2Al(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2(g) 3 moles of H2(g) is produced for every 2 moles of Al(s) Both the aluminum and the zinc contained in the alloy react to produce hydrogen gas. The reaction occurs in a test tube and generates
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Name:_________________________ MASS AND MOLE RELATIONSHIPS IN A CHEMICAL REACTION PRE-LAB QUESTIONS 1. Balance the equation for the reaction of barium chloride with silver nitrate. 2. Predict the mole ratio of BaCl2 to AgCl for the equation. 3. If an experiment with 10.2 g barium chloride produced 14.5 g silver chloride‚ calculate the experimental mole ratio of silver chloride to barium chloride. Name:_______________________
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the amount of moles of each. To find the amount of moles we must solve for them: Zinc = (2.4375g / 1) X (1 / 65.38g) = 3.73 X 10-2 moles Copper = (0.0625g / 1) X (1 / 63.546g) = 9.835 X 10-4 moles The balanced equation for zinc and HCl is Zn + 2HCl = 1H2 + 1 ZnCl2 H=1‚ Zn = 65.38‚ Cl=35.45 Molar Mass of HCl = 101.83 (3.73 X 10-2 moles Zn) (2HCl/1Zn) = 7.46 X 10-2 moles HCl The amount of HCl that should be used is: 50mL of HCl = .05 L of HCl 7.46 X 10-2 moles of HCl X 2 = .1492 moles of HCl used
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