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Question: You jump from a plane flying at an altitude of 4.1 km. You accelerate at -6.1 m/s2 until you reach a terminal speed of 30 m/s down. How long does your fall last?
The enthalpy of combustion of C12H22O11is -5652, A 2.5 g sample of lactose was burned in a calorimeter that contained 1350g of water. The heat capacity of the calorimeter is 1630 J/C, and the initi
Assuming no deviation from Raoult's Law, what is the vapor pressure of a solution of 0.750 mol of n-pentane and 1.000 mol of n-hexane?
Waste water from certain industrial chemical processes contains aqueous ions. Since the mercury ion is toxic, it is removed from the waste water by reaction with aqueous sodium sulfide. The product
How many phospholipid molecules with an area of 8 X 10^-19 m^2 are needed to make the cell membrane for a cell of 10um diameter.
At 25 degree Celsius, an aqueous solution containing 35.0wt% H2SO4 has a specific gravity of 1.2563. Calculate the required volume (L)of the solution using the given specific gravity.
When 24.0g of glucose (a nonelectrolyte) are dissolved in 500.g of water the solution has a freezing point of -0.47degreee C. What is the molar mass of glucose?
The composition of a propane clathrate was found to contain 47.6 mL of water. Assuming that all the cavities of the clathrate was filled with propane, how many grams of propane did the clathrate conta
If your lab partner has a bad habit of measuring volumes in a graduated cylinder from the top of a meniscus instead of from the bottom, will your value for Avogadro's number be increased or decrease
Draw a rectangle that gives a visual representation of the problem. Use the specified variables to label the sides of the rectangle.
An Aqueous solution of ethanol, C2H5OH, is 19.00% ethanol by mass and has a density of 0.9700 g ml^-1. Calculate the molarity of the ethanol solution?
At 884 K the equilibrium conditions for the reaction. PCl5(s) + H2O(l) = 2 HCl(g) + POCl3(g) are [PCl5] = 0.714 M; [H2O] = 2.66 M ; [HCl] = 1.41 M and [POCl3] = 0.772 M. Given these conditions, calcul
Explain how the structural composition of an ATP molecule makes this molecule important as the energy currency of the cell and describe how ATP is capable of transferring energy from catabolism to a
Suppose a wire is stretched tightly around the Earth. (The radius of the Earth is approx. 6,400 km.) If the wire is cut, its circumference is increased by 20 meters, and the wire is placed back arou
A 1.5 mol sample of PCl5 is injected into a 0.50-L reaction vessel. Calculate the concentration of each gas at equilibrium.
When 0.848 g of finely divided iron is burned, 1.212 g of a reddish brown oxide is obtained. Write a balanced chemical equation for the reaction of iron and molecular oxygen based on the empirical f
The tank is filled with O2 to a pressure of 175 atm at 25°C. How many moles of O2 does the tank hold, and what volume would the gas occupy at 1.00 atm and 25°C?
Consider the equation (-1)(-1)+(-1)=0. How can this equation be true? Can you use the properties of operations to prove your conjecture?
If 11.7 grams of carbon dioxide is produced from the decomposition of 30.7 grams of calcium carbonate, what is the percent yield of the reaction?
Ann earns $7.75 per hour working. She needs at least $425 for a stereo. Write an inequality that describes how many hours she must work to reach her goal.
A diatomic gas at high temperature shows a series of vibrational absorptions. By accident, some of the data are lost but it is known that the absorption frequencies included 5600, 11200, and 14000 w
Use the radius of a sodium atom from the elements handbook to calculate the number of sodium atoms in a row 5.00 cm long. Assume that each sodium atom touches its two neighbors.
Write the total ionic and net ionic equations for the reaction of aqueous silver nitrate with a calcium chloride solution.
What is the mole fraction of each gas in the mixture? If the mixture occupies a volume of 10.5 liters at 65°C, calculate the total number of moles of gas in the mixture.
For each element, first write the electronic configuration of all the electron then give the electronic configuration of the valence electron only: [a] magnesium [b] strontium [c] flourine.