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Question 1: Magnesium chloride is often used to "salt" ice that has accumulated on roadways. why would magnesium chloride be preferred over sodium chloride?
Question 2: Describe the difference between the temperature vs time cooling curve of a pure substance and a solution.
While in Europe, if you drive 109 km per day, how much money would you spend on gas in one week if gas costs 1.10 euros per liter and your car's gas mileage is 29.0 mi/gal? Assume that 1euro=1.26 dollars.
When 414 J of heat is added to the gas, it expands and does 104 J of work on the surroundings. What is the value of delta H?
Which of the following factors affect the resolution (separation) of two compounds: (A) nature of the stationary phase; (B) eluent composition; (C) amount of sorbent used; (D) color of compounds being separated?
The vaporizaation for the compound is 24.75 kJ/mol. Calculate the heat required to convert 50.0 g of freon 11 from liquid at -50 C to a gas at 50 C.
Consider the titration of 100.0 mL of 0.100 M H2NNH2 (Kb = 3.0 10-6) by 0.200 M HNO3. Calculate the pH of the resulting solution after 100.0 mL of HNO3 have been added.
Calculate the overall energy change in kilojoules per mole for the formation of CaCL(s) from the elements. The following data are needed
What is the percent by mass of oxygen in a gaseous mixture whose molar composition is 0.500% CO2 and 99.500% air? The composition of air is 21% mole O2
Styrene is produced by catalytic dehydrogenation of ethylbenzene at high temperature in the presence of superheated steam. A.) Given the following data, what is the delta Hrxn, delta Grxn and delta Srxn at 298 K.
PH And Percent Ionization, 1. Determine the pH and the percent ionization in a 0.50M solution of KOBr. The Ka for HOBr = 2.5 x 10 ^ -9.
Write the formula for each component in a buffer solution of acetic acid and it's salt. How would you prepare 20 mL of a solution having pH = 2.00 by dilution of 0.10 M HCL
Which of the following statements correctly describe CH3COOH (acetic acid)? -There are 2 atoms of carbon in one molecule of acetic acid -The molar mass of acetic acid is 29.02 g/mol.
How long would it take the same number of moles of Ar(g) to effuse through the same membrane?
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