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Carbon dating may be used to date (once living) materials that are between 100 and 40,000 years old. The half-life of the first-order decay of carbon-14 is 5730 years. What percentage of carbon-14 remains in a sample after 1.99 x 10^4 years?
How would you prepare a 25.0% water in ethyl alcohol solution using 100.0 ml of ethyl alcohol (the density of alcohol is 0.7893 g/ml)
ammonium nitrate is a common ingredient in chemical fertilizers. use the reaction shown to calculate the mass of solid
The conversion of glucose into lactic acid drives the phosphorylation of 2 moles of ADP to ATP and has a deltaG= -135 kJ/mol. What is the deltaG for the conversion of glucose into lactic acid
Determine (a) the total work done by the air and (b) the work done against the spring. Also, show the process on a P-v diagram.
Determine the molecular formula of an unknown perfect gas composed primarily of Nitrogen and Oxygen. At -3 degrees Celsius and when the pressure is 101.325kPa the density is 1.354 g/L.
Calculate the capacity factor for decane on HP-1 column (25 m length, 0.25 mm I.D., 0.5 mkm film thickness) at 120 C. Explain.
The alpha-particles ionize molecules in the air, allowing it to conduct an electric current. When smoke particles enter, the conductivity of the air changes and the alarm buzzes. (a) Write the equation for the decay of (mass number 241, protons 95..
Determine the root-mean-square speed of CO2 molecules that have an average kinetic energy of 4.2 x 10^-21 J per molecule.
Compute the theoretical amount of CaCl2 that would be needed to change the temperature of 50ml of water from room temperature 20degreesC to 45degreesC.
the tip of a vinegar buret but disappears during the course of the titration, how would this affect your calculation of the concentration of acetic acid
A certain weak acid, HA, with a Ka value of 5.61*10 raised to negative 6 is titrated with NaOH. A solution is made by mixing 7.00 mmol of HA and 1.00 mmol of strong base. What is the ph
How many grams of CaH2 (Molar Mass = 42.1 g/mol)are needed to generate 16.0 L of H2 gas if the pressure of H2 is 729 torr at 21.0°C?
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