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A freshly prepared sample of curium-243 undergoes 3312 disintegrations per second. After 6.00 years, the activity of the sample declines to 2755 disintegrations per second. Calculate the half-life of curium-243. half-life = ______________ yrs
a flask containing 352 ml of gaseous nitrogen is collected over water at a temperature of 22 degree Celsius. the total pressure of the gases was 742 mm Hg. how many grams of nitrogen were collected?
A sediment sample of clay was equilibrated with ammonium ion (NH4+). The ammonium ion was then displaced with Na+. The total amount of ammonium that had been adsorbed.
Determine the mass of carbon dioxide (in g) produced from the complete combustion of 1.40×10-2 g of C6H10 with excess oxygen.
A 12 liter tank contains helium gas pressurized to 160 atm. What size tank would be needed to contain this same amount of helium at 1 atm
Student B's results are 8.4 g/cm^3, 8.8 g/cm^3, 8.3 g/cm^3. Compare the two sets of results in terms of precision and accuracy.
a student placed 14.5 g of glucose rm c6h12o6 in a volumetric flask added enough water to dissolve the glucose by
What wavelength is expected for light composed of photons produced by an n=3 to n=1 transition in a hydrogen?
What is the percent dissociation of HNO2 when 0.056 g of sodium nitrite is added to 115.0 mL of a 0.057 M HNO2 solution? Ka for HNO2 is 4.0 × 10-4.
The sulfur and hydrogen in the fuel are completed oxidized to SO2 and H2O. 8% of the carbon is oxidized to CO, and the balance forms CO2. Calculate the dry basis mole fractions of the flue gas
What ions will the following elements form? Enter the letter of the item in Column Two that best matches the item in Column One.
What mass of solid potassium nitrite would need to be dissolved in 500. mL of 0.40 M HNO2 to make 500. mL of a NO2?/HNO2 buffer solution that has a pH = 3.25? Ka of HNO2 = 7.1 x 10?4
A sports-ultility vehicle has an average mileage rating of 18 miles per gallon. How many galllons of gasoline are needed for a 397-mile trip
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