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The main reason that distillation is a costly method for purifying water is the high energy required to heat and vaporize water.
(a) Using the density, specific heat and heat of vaporization of water from Appendix B, calculate the amount of energy required to vaporize 1.00 gal of water beginning with water at 20 °C.
(b) If the energy is provided by electricity costing $0.085 / kWh, calculate its cost.
(c) If distilled water sells in a grocery store for $1.26 per gal, what percentage of the sales price is represented by the cost of the energy?
A student added more KSCN solution that instructed when making standard solution. assuming no other errors were made in the experiment
a buffer solution was made to have 1.4M HF and 1.10 M NaF. If .1 moles of NaOH are added to 1.00 L of the buffer, what will be the pH? Assume the volume remains constant. Ka of HF = 7.2E-4.
Problem- The PH of aqueous (0.20 M) PROPYLAMINE (C3H7NH2), a weak base, was measured to be 11.96. 1- What are the value of Kb and PKb of proplamine
A 32.65-g sample of a solid is placed in a flask. Toluene, in which the solid is insoluble, is added to the flask so that the total volume of solid and liquid together is 54.00 mL
magnesium carbonate was added to 25cm cubed of 2.0 moldm cubed of nitric acid. they react in the following reaction
The mass spectrum of an organic compound shows the relative abundances of M to be 58.09% and M 1 to be 15.08%. Assuming the peaks are caused by 12C and 13C isotopes, determine the number of carbon atoms in the compound
A sealed container of oxygen gas has a pressure of 44.2 atm at 319.0 K. If the container is cooled to 239.0 K, what is the new pressure of the gas
If liquid mercury as well as oxygen combine to make mercury(II) oxide, define what is the percent yield of HgO if 350.0 grams of Hg(l) react with 150.0 g of O2(g) to produce 272.3 grams of the product
calculate the final temperature of a mixture of 110.0 g of ice initially at -10.5 degrees celcius and 396.0 g of water
Lewis Bases given their lone pairs on the central atoms, however, none of them actually are. Why are OF2 and SF4 are strong Lewis Acids and not Lewis Bases
sodium hypochlorite is potentially dangerous because of the basicity of ClO-. What is the [OH] in an aqueous solution that is 6.5% NaClO by mass? What is the pH of the solution
Which of the following statements about the reaction quotient, Q is false. A) The value of Q can be used to predict equilibrium concentrations B) It has the same expression as Kc
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