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Can the RN use acupressure for pain or discomfort?
A 269 mg sample of rock was found to have 2.45 × 10-6 mol of potassium-40 (t1/2 = 1.3 × 109 yr) and 2.45 × 10-6 mol of argon-40. How old was the rock? What assumption is made about the origin of the argon-40?. Enter your answer in scientific notat..
What volume of 18.5 C Water must be added together , with a 1.23 kg piece of iron at 68.5 C , so that the temprature of the water in the insulated container such as the temprature remains constant at 25.6 C
How many grams of iron are required to make 2.50 L of aqueous solution containing 8.00 % Iron (III) chloride by mass. The density of the solution is 1.067g/mL
CCl4 lowered the freezing point of the solvent by 5.40 K . Calculate the molar mass of the compound.
A 1.000L sample has HCL gas at 25 C and 732.0mm HG was absorbed completely in an aqueous solution that contained 6.954g of Na2CO3and 250.0 g water.
A 99.8mL sample of a solution that is 12.0% KI by mass(d=1.093g/mL) is added to 96.7mL of another solution that 14.0%Pb(NO3)2 by mass (d=1.134g/mL). How many grams of PbI2 should form.
The nuclide As-76 has a half-life of 26.0 hours. If a sample of As-76 weighs 344 g, what mass of As-76 remains after 538 minutes.
If the spectrophotometer that was used was miscalibrated so that each absorbance reading was too high by 0.100 units
Calculate the net work done on the surroundings by these three irreversible expansions. Compare this value with the amount of work that would be done in a reversible isothermal expansion from 50.0 to 0.500 bar at 25.0 degrees.
question an acetylene tank for oxyacelylene welding will provide 9340 liters of acetylene gas c2h2 at stp. how many
how many grams of sodium fluoride used in water fluoridation and manufacture of insecticides are needed to form 485 g
Calculate the pH at the equivalence point for the titration of 0.230 M methylamine (CH3NH2) with 0.230 M HCl.
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