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The nuclide 241Am decays with a half life of 458 yrs. If the activity of 241Am in the detector is 3*10^4 Bq, calculate the mass of 241Am present.
Determine the number of vacancies per cm3 in gold at 900?C, given a vacancy formation energy of 0.98 eV/atom and an Arrhenius pre-exponential factor of one
What is so good about supercritical CO2? Wouldnt its widespread use contribute to climate change?
Calcium phosphide reacts with water according to the equation. Using 84.0g of Ca ?P? and 36.0g of H?O, What volume of PH? will be produced at 273 K and a pressure of 1520 torr
The molecular formula of glycine (an amino acid) is NH2CH2COOH, the molecular mass is 75.07grams/mole. If 10 glycines are joined together by a dehydration reaction to make a polypeptide, what would the molecular mass of the polypeptide equal
What other substance(s) found in chocolate bear(s) a strong structural resemblance to caffeine? Draw the structures of these substances and point out the similarities.
The volatile liquids A and B are confined to a piston and cylinder assembly. The pure vapor pressure of A is 165 torr, and for B is 85.1 torr. Initially only the liquid phase is present
What is the pH of a solution made by dissolving 46 g of acetic acid in enough water to make 700 mL of solution. Ka = 1.8 x 10^-5
How long does it take to electroplate 0.5 mm of gold on an object with a surface area of 31 cm2 from an Au3+(aq) solution with a 8 A current. Recall the density of gold is 19.3 g/cm3.
When an ionic solid dissolves in water, water molecules attract the ions causing them to dissociate of come apart. The resulting dissolved ions are electrically charged particles that allow the solution to conduct electricity.
A sample consisting of 3.0 mol of ideal gas molecules at 200K at 2.00 atm is compressed reversibly and adiabatically until the temperature reaches 250K.
Liquid nitrogen has a density of 0.808 g/mL at 77 K. A sample of 1.5 L of liquid nitrogen is allowed to evaporate at 22.2 °C and 0.998 atm of pressure. What volume will the nitrogen gas occupy
What is the pH if 100 mL of 1.00M NaOH is added to the buffer into 30.0 grams of solid NaF is placed in 1.00 liter of a 1.00M HF solution for Ha, Ka=6.8x10-4
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