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A) A 205 ml sample of ocean water contains 6.8g of NaCl. What is the molarity of the solution with respect to NaCl?
B) How much of a 12.0 M HNO3 solution should you use to make 850.0 ml of a 0.250M HNO3 soution?
C) How much of a 5.0 M sucrose solution should you use to make 85.0 ml of a 0.040 M solution?
Calculate the energy per photon of electromagnetic radiation, for a photon having a frequency of 5.16 X 10^19 Hz (h = 6.626x10^-34 J s):
Elliptical holes estimate the angle of entry : Cos A bullet hole in a wall at a crime scene is elliptically shaped. The loner dimension is 20 mm and the shorter dimension is 14 mm. What is the angle of entry?
what is the quantity in grams of formic acid and sodium formate necessary to make 500 mL of a buffer that has a formic acid concentration of .75 M and a sodium formate concentration of .75 M?
Do you think a comparable spill of a water-insoluble liquid that has a density of 1.20g/mL would have been as harmful to waterfowl and aquatic mammals.
What weight of Pb(NO2)2 wil have to be dissolved in one liter of water to prepare a 100ppm Pb2+ solution.
Which one of the following compounds will be most soluble in water?
Diethyl amine density (1.0475 g/mL) Diethyl amine MW 73 Diethyl ether density (0.714 g/mL) Hint: Consider at which temperature the reaction is run. Which of the boiling points and melting points might come into play?
A 1.80-L flask is filled with propane gas (C3H8), at 1.00 atm and -19.4°C. What is the mass of the propane in the flask.
A weather balloon at launch is partially inflated with 3.00 times 10 power 4l of helium at STP. what will be the volume of helium at an altitude of 7km, where the pressure is 0.41atm and the temperature is -20 degrees Celsius?
A helium-filled balloon has a volume of 2.75 L at 17 C. The volume of the balloon decreases to 2.36 L after it is placed outside on a cold day. What is the outside temperature in K?
how much must you perspire to maintain a constant body temperature assuming no other energy changes and all the calorie content of the soda is released as heat?
If 1.19 mL of a 1.4 x 10-5 M stock solution is pipette into a test tube, and 8.81 mL of water is added to the test tube and mixed, what is the concentration of the new solution in the test tube?
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