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what is the molecular mass nonionic solutes of 8.02 grams of solute in 861 grams of water lower the freezing point to -0.430 c.
what is the change in pH after addition of 10.0mL of 1.0M sodium hydroxide to 90.0mL oof a 1.0M NH3/1.0M NH4+ buffer? (Kb for ammonia is 1.8 X 10-5)
The carbon-14 activity of some ancient Native American corn was found to be 7.0 disintegrations per minute (dpm) per gram of carbon. If present-day plant life has 16 dpm per gram of carbon
What is the relationship between myelin sheath and dopmaine? What does myelin sheath do, how does it porvide insultion. What disease are caused when myelin sheath stops working and how does this effect elderly people?
Using the inverse square law of radiation, what Geiger counter reading would you get for a radioactive material when you are 3 feet from the source
Nitrogen gas has a Henry's law constant k = 6.3 × 10-4 M/atm at 25°C. The "bends" in divers results from bubbles of N2(g) being rapidly released from body fluids when a diver ascends to the surface too quickly.
Determine the percent yield for the reaction between 45.9g of NaBr and excess chlorine gas to produce 12.8g of NaCl and an unknown quantity of bromine gas.
A dog sits 1.07 m from the center of a merry go-round with an angular speed of 1.44 rad/s. If the magnitude of the force that maintains the dog's circular motion is 41.2 N.
1g soil has been spiked with 0.1ml of 100 ppm (v/v) trimethylbenzene and subsequently extracted with 250 mL pentane. The extract is then measured with GC-FID.
what is the keq value for the acid base reaction between sulfuric acid and nitric acid? Assume that pka of the conjugated acid of nitric acid is -13.
2.00 moles of a gas occupies 62.2 L at a particular temperature and pressure. Its density is 0.900 g/L. The standard molar volume is 22.4 L/mole. What is the molar mass.
A graduated cylinder contains 148 of water. A 17.0 piece of iron (density = 7.86 ) and a 19.0 piece of lead are added. What is the new water level in the cylinder?
How many grams of O2 are needed to react with 18.5 grams of Mg? 2 Mg(s) + O2(g) → 2 MgO(s)
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