penalise for missing units 3 b) Moles of solution A 8.5 x 0.25 ½ = 0.002125 ½ moles 1000 c)i) Moles of HCl in 25cm3 of solution D: HCl + NaOH NaCl + H2O 1 : 1 ½ Moles of HCl in 25cm3 = 0.002125 ½ ( Mole ratio) ii) Moles of HCl on 100cm3 of solution D 25 0.002125 100x 0.002125 ½ = 0.0085 moles ½ 25 iii) Moles of HCl in 100cm3 Solution B: 0.5 moles 1000cm3 0.5 x 100cm3 = 0.05moles
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Objective: To determine relative molecular mass of a soluble base‚ X2 CO3 by carrying out an acid-base titration with the following reaction ‚ knowing the amount of hydrochloric acid used and the amount of substance Z used. Hypothesis: The X in substance Z is a group 1 element because substance Z is a soluble metal carbonate and would most likely be sodium or potassium because these elements are commonly used. Materials 100 cm3 beaker‚ 250 cm3 beaker‚ 250 cm3 volumetric flask with stopper
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and the average change in mass of burner for each of the fuels. The averages were based on five trials. PropanolTheoretical Heat of Reaction: Bonds Broken Bonds Formed Type of Bond Bond Energy (KJ/mole) Number of Bonds Total (KJ/mole) Type of Bond Bond Energy (KJ/mole) Number of Bonds Total (KJ/mole) C-H 412 7 2884 C=O 802 6 4812 C-C 348 2 696 H-O 463 8 3704 O=O 496 5 2480 C-O 366 1 366 O-H 463 1 463 Total 6889 Total 8516 Table 5: Shows the theoretical heat change in enthalpy for Propanol From
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weight of Ferrocene 0.225 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
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50V 4. Convert the following masses into moles. A. 135 grams of Aluminum. Molar Mass of Aluminum = 26.98g/mol # moles Al = 135g x 1 mole = 5.0 moles 26.98g B. 1.0 grams of Copper. Copper Molar Mass = 63.55g/mol # moles Cu = 1.0g x 1 mole = 0.016 moles 63.55g 5. Convert the following moles into masses. A. 0.160 moles of Magnesium. Mg Molar Mass = 24.31g/mol
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= 65 + 32 + (16 x 4) =161 * Mass of water in 1 mole of ZnSO4 = Mr ZnSO4 x Mass of water Mass of anhydrous salt * Mas of water in 1 mole of ZnSO4 = 161 x 5.79 = 129.29 7.21 * Moles of water in 1 mole of ZnSO4 = Mass of water in one mole of ZnSO4
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grams/mole‚ what’s the molecular formula? 3. What’s the empirical formula of a molecule containing 18.7% lithium‚ 16.3% carbon‚ and 65.0% oxygen? 4. If the molar mass of the compound in problem 3 is 73.8 grams/mole‚ what’s the molecular formula? Write the molecular formulas of the following compounds: 5. A compound with an empirical formula of C2OH4 and a molar mass of 88 grams per mole. 6. A compound with an empirical formula of C4H4O and a molar mass of 136 grams per mole.
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Mass/Mole Problems 1. Determine the molar masses of the following compounds: a. dinitrogen pentoxide c. sodium carbonate b. ammonium phosphate 2. Calculate the number of atoms in 20.0 grams of calcium. Road map: grams ( mols( atoms 20.0 g Ca x 1 mol Ca x 6.02 x 1023 atoms Ca 1 40.01 g Ca 1 mol Ca atoms 3. What is the mass of 6.20 moles of potassium
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is trapped inside the hydrated solid structure is called water of crystallization or water of hydration. A salt with associated water of crystallization is known as a hydrate. The formula of a hydrated salt is written as the number of moles of water present in one mole of crystalline structure. Deliquescent materials are substances that absorb water from the atmosphere and eventually become hydrated. These materials‚ usually salts‚ tend to have a high affinity for water. During this process‚ the
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Hydrochloric acid ---- Calcium Chloride + water + carbon dioxide. CaCO3 + 2HCl ---- CaCl +H2O + CO2 Measurements and Variables: The variables I have chosen to change is strength of the hydrochloric acid which will be 1 mole‚ 0.7 mole‚ 0.5 mole‚ 0.3 mole and 0.1 mole some variable I will not be using are temperature‚ mass‚ density. The measurements I will be using are time (s) and volume in (cm3). Fair Test: To make sure this a fair test I will get exact amounts of the Hydrochloric acid
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