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A wooden object from the site of an ancient temple has a carbon-14 activity of 13.0 counts per minute compared with a reference piece of wood cut today that has an activity of 104 counts per minute if the half life for carbon is 5730 years what is the age of the ancient wood?
Which of the following is true regarding the solubility of gases in liquids? A) solubility always decreases as temperature increases B) solubility always increases as temperature increases
you have a 5.68 g sample of a compound with the formula xcl2 where x is a metal cation. when the sample is treated with
The concentration of Mg2+ in seawater is 0.052 M. At what pH will 77% of the Mg2 be precipitated as the hydroxide salt? [Ksp for Mg(OH)2 = 8.9 10-12.]
A 1.994 g sample of ethanol is combusted in a bomb calorimeter. The temperature of the calorimeter increases by 10.91 K. If the heat capacity of the bomb is 615.5 J/K and it contains 1.150 kg of water, what is the enthalpy change per mole of ethan..
How many grams of dry NH4Cl need to be added to 2.30L of a 0.800 M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.83? Kb for ammonia is 1.8 * times 10^-5
Molecules can be as small as a few atoms or as large as thousands of atoms. In 1962, Max F. Perutz and John C. Kendrew were awarded the Nobel Prize for their discovery of the structure of hemoglobin
The absorbance of solutions containing Cr as dichromate Cr2O7-2 in 1.0M H2SO4 were measured in a 5cm cell. The following results were obtained
A compound composed of iron and carbon monoxide, Fe x (CO) y, is 30.70% iron. What is the empirical formula for the compound
The compounds listed above were heated in ethanol and sodium hydroxide for approximately 60 minutes. Then extracted with dichloromethane to get the final product.
At 25oC, the vapor pressure of the cyclohexane liquid "C6H12" is 70.0 mmHg and that of the toluene liquid "C7H5CH3" is 22.0 mmHg. The mole fraction of toluene in an ideal solution of cyclohexane and toluene that has a vapor pressure equals to 53.2..
a tank contains 150.0 g of co2 and 24.0 g o2 at a total pressure of 4.25 atm and a tempature of 25.0*C. Calculate the partial pressure of O2.
a 20 year old male was brought to paramedics after ingesting 100mL of pure ethylene glycol which is a lethal dose. The hospital pharmacy is out of ehtanol so they use a bottle of 100-proof whiskey in your medical bag.
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