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Problem- Assume that the molar freezing point depression constant of water is 1.86C kg/mol and that the freezing point of water is 0.00C
1) Complete the following raction showing what ions calcium chloride will produce upon dissolving in water.
2) Calculate the molality (in m) of all solutes (that is all ions in the problem) of .15m calcium chloride aqueous solution.
Solve the above problem
for a certain change, the value of change in U is -2.37kJ. during the change the system absorbs 650 joules. how much work did the system do?
Of sublimation, recrystallization, distillation, and extraction, which purifications methods should be used to purify the following: a) a crude solid mixture that is 90% pure
If you had 6.02 x 10^23 dollars, and could spend it at 1 billion per second for your entire life (75 years), what approximate percentage of your original money would you have left?
For the following reactants, predict the products formed (if any) and write the balanced molecular equation, complete ionic equation and net ionic equation. Ca(s)+ HCI(aq)
bone was dissolved in hydrochloric acid giving 50.0 ml of solution containing calcium chloride cacl2. to precipitate
Consider the reaction with the rate law, Rate = k[BrO3-][Br-][H+]2 By what factor does the rate change if the concentration of BrO3- is tripled and that of Br- is tripled
Ethanol has a heat of vaporization of 38.56 kj/mol and a normal boiling point of 78.4 C. What is the vapor pressure of ethanol at 14 C
Approximate the percent increse in waste size that occurs when a 155lb person gains 40.0 lbs of fat. Assume that the volume of the person can be modeled by a cylinder that is 4.0 feet tall.
A student was preparing to recrystallize a solid using mixed-solvent recrystallization. He planned to dissolve the sample in boiling methanol, and then add hot pentane to induce crystallization
What are some of the best ways to increase percent yield of a hypothetical reaction? Assume you know the limiting reagent and non-limiting reagents of this reaction.
How do I know if an E1 or E2 reaction is exothermic or endothermic overall. Can it ever be endothermic? If so, when. All the examples I've seen are exothermic.
Calculate the mass of water produced when 9.11 g of butane reacts with excess oxygen. Express the mass of water numerically in grams.
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