to determine the molar mass of the reactants which formula would you calculate i
ID: 890607 • Letter: T
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to determine the molar mass of the reactants which formula would you calculate it for? Please answer questions 1-4. For number two i was thinking that we shouldnt use excess water to dissolve the solid. Also, for number 4, is it correct to say that acetone is added to percipitate out the Ni(en)3Cl2 product? Pre-Lab Exercise: 1. To determine the molar mass of the reactants would you calculate it for H2NCH CH2NH2 or for 3H2NCH2CH2NH2? 2. What precautions must be taken knowing that Ni(en),Cl2 is soluble in water? 3. If you were to use a 32.5% ethylenediamine solution and the density ofthe solution is 0.985 g/mL, what is the mass of the ethylenediamine in 3.4 mL of this solution? 4. What is the function of the acetone in this experiment? 5. What are the safety precautions in the use of acetone?Explanation / Answer
1)
Always calculate for a unity mole (that is the H2NCH2CH2NH2)
2)
Avoid moisture/humid containers/equipment
3)
0.985 g/ml * 3.4 ml = 3.35 g of solution, but only 0.325 is it so 0.325*3.35 = 1.088 grams of Ethyladiamine
4) Acetone is a solvent
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