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The half-life of C-14 is 5730 years. A fossil was analyzed and determined to have a carbon-14 level that is 50.0 % that of living organisms. How old is the fossil?
Compute the ratio of the concentration of H 2 CO 3 to that of the HCO 3- if The pH of a bicarbonate-carbonic acid buffer is 8.50
What is the emprical formulae of the compound whose composition by mass is 1.32g of carbon dioxide contain 0.36g of carbon.
Determine what is the density of the oxygen gas in the full bottle If A cylindrical gas lecture bottle has internal dimensions of 18.0 cm in diameter and a height of 49.0 cm and weighs 1.75 kg when empty.
If you have 400mL of .5 M NH3, how many moles of .47 M HCl must be added to the ammonia solution to reach the equivalence point.
A solution is made by mixing 506 mL of water and 198 mL ethanol. What is the concentration of ethanol in units of volume/volume percent.
At 0.0oC, if the volume of air is 3.4 mL and the pressure of the atmosphere that day is 695 mmHg, what is the number of moles of air?
100 mL of 0.200 M HCl is titrated with 0.250 M NaOH .What is the pH of the solution at the equivalence point?Express the pH numerically.
Write the nuclear equation for the alpha decay ( production of radioactive decay that may be considered radioactive waste products by the useful production of nuclear energy ) of each nuclide that are products of a nuclear power plant Rn-222, T..
Celsius the initial concentration of the three gases are.3M H 2 S,.3H 2 and .150 S 2 you just need to determine the equilibrium concentrations of all these given 3 gases?
Calculate the reaction Zn(s) + 2HCl(aq) ! ZnCl2(aq) + H2(g) What mass of ZnCl2 (MW = 136.3 g/mol) can be prepared from the reaction of 3.27 grams of zinc (MW = 65.38 g/mol) with 3.00 grams HCl (MW = 36.46)?
Consider 25.0 g of water at 21.7°C that are mixed with 25.0 g of water at 43.3°C in a foam cup calorimeter. The equilibrium temperature reached was 30.4°C.
Tincture of iodine is I2(s) dissolved in ethanol, C2H2OH. A 1% solution of tincture of iodine is 10.0g of solute for 1000g of solution.
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