What mass of ccl2f2 must evaporate
What mass of CCl2F2 must evaporate in order to freeze 115 g of water initially at 21 C? (The heat of fusion of water is 334 J/g the specific heat of water is 4.18 J/g *K .)
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What is the purpose of anhydrous CaCl2? Why it is important that none of the solid CaCl2 be included in the final distillation of your 1-bromobutane?
You are asked to go into the lab and prepare an acetic acid-sodium acetate buffer solution with a pH of 4.40 ± 0.02. What molar ratio of CH3COONa (conjugate base) to CH3COOH (weak acid) should be used?
If a diamond is made out of pure carbon and has a density of 3.52 g/cm3, how large would a mole of carbon atoms (in diamond form) be in cm3? Compare this volume to the amount of volume that 1 mole of water occupies.
The mass of iron produced by the reaction of 7.00 kg of Fe2O3 and 3.00 kg of CO is 3.55 kg. What is the percent yield? (Atomic weights: Fe = 55.85, O = 16.00, C = 12.01)
A concentration cell consists of two H2/H+ half cells. Half cell A has H2 at 0.87 atm bubbling into 0.10 M HCl. Half cell B has H2 at 0.45 atm bubbling into 2.2 M HCl. What is the voltage of the cell?
What is the orientation of the hydroxyl group when the compound is in chloroform solution? What evidence supports this?
What is the freezing point in Celsius of a solution prepared by dissolving 6.20 g of MgCl2 in 110 g of water? The value of Kf for water is 1.86 (C*kg)/mol), and the van't Hoff factor for MgCl2 is i = 2.7.d
Rather than weigh the sample on a balance, a chemist chooses to dispense the liquid using a graduated cylinder. What volume of the liquid should he use?
Calculate the ΔH for the reaction above using the data provided. (Hint: you need to calculate q rxn then convert it into kJ/mole)
Describe in a 150 word essay in any writting style the adverse effects caused by exposure to radiation. Include some specific exposure levels associated with these significant health effects.
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