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1)By mass spectral analysis, a sample of strontium is known to contain 2.64x1010 atoms of Sr-90 as the only radioactive element. The absolute disintegration rate of this sample is measured as 1238 disintegrations per minute. Calculate the half-life (in years) of Sr-90.
2)How long will it take (in years) for the disintegration rate of this sample to drop to 954 disintegrations per minute?
Nitric acid is usually purchased in a concentrated form that is 70.3% HNO3 by mass and has a density of 1.41 g/mL
Calculate the heat of neutralization when it is given that : heat capacity of the calorimeter =28.7 J/oC ,the specific heat of the mixture =4.184 J/goC, density of the solution =1.02 g/mL.
The water level in the Carbon dioxide collection cylinder is higher than the water(H2O) level outside the cylinder.Is the wet carbon dioxide gas pressure greater or less than atmospheric pressure.
How many joules of energy are needed to melt 54 grams of ice at its melting point? Assume that the molar heat of fusion of ice is 6 kJ/mol.
A stock solution of perchloric acid is 70.5% by mass HClO4 and 29.5% by mass water. The density of the solution is 1.67 g·mL-1 at 20 C. Calculate the molarity of the solution.
You have 250.0 mL of a 0.56M solution of sodium acetate. How many mL of 0.50M acetic acid should be added to make a buffer of pH 4.40.
The solubility of the ionic compound M2X3, having a molar mass of 238 g/mol, is 2.89 10-7 g/L. Calculate the Ksp of the compound
How did I get a greater than 100% recovery of benzoic acid?, To quickly summarize, the lab dealt with isolating benzoic acid from a mixture via chemically active extraction.
A lab protocol on synthesizing sulfathiazole from p-acetamidobenzenesulfonyl chloride and 2-aminothiazole. It would be appreciated if exact amounts of reagents, solvents, etc (in grams, mmols, mls - etc), could be given.
A helium balloon at a high altitude has 2.1 × 104 L of helium at 0.40 atm and -13°C. If the balloon descends to an altitude in which the atmospheric pressure is 1.00 atm and the temperature is 20°C.
Calculate the amount of heat required to completely sublime 68.0 g of solid dry ice CO_2 at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3 kj/mol.
The heat of fusion of thallium is 21 j/g, and its heat of vaporation is 795j/g. The melting anf boiling points are 304 degress celcius. The specific heat of liquid thallium is 0.13 j/g*c.
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