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The initial concentration of a reactant in a first order reaction is 0.620 molar. What will be its concentration after 3 half-lives?
1. 0.103 M
2. 0.310 M
3. 0.0775 M
4. 0.207 M
5. 0.0865 M
Calculate delta Grxn(in KJ) for the following reaction at 298K: 2H2(g)+CO(g)=CH3OH(g) given that delta H=-90.7 Kj and delta S=-221.5 J/K for this process.
A certain substance has a heat of vaporization of 34.75 kJ/mol. At what Kelvin temperature will the vapor pressure be 4.00 times higher than it was at 289 K
Calculate the molarity of a solution of acetic acid made by dissolving 19.00 of glacial acetic acid at 25 in enough water to make 230.0 of solution.
a solution is prepared by mixing 62.0 ml of 5.00 m hcl and 30.0 ml of 8.00 m hno3. water is then added until the final
A) Calculate the molar solubility of Ni(OH)2 when buffered at pH=8.0 B) Calculate the molar solubility of Ni(OH)2 when buffered at pH=10.0 C)
The half-life for a first-order reaction is known to be 680 seconds at a given temperature. What is the rate constant at this temperature
Pike's peak in Colorado is approximately 4,300 m above sea level. What is the boiling point of water at the summit and will a camper need longer or shorter time to cook food at the summit as compared to the cooking at the sea level
Caculate the wavelength of light( in nanometers) that is absorbed when the electron in a He+ ion goes from the n=2
A copper,(Cu(s) , electrode is immersed in a solution that is 1.00 M in ammonia,NH3 , and 1.00M in tetraamminecopper(II),[Cu(NH3)4]^2+ . If a standard hydrogen electrode is used as the cathode,
At 450 Celsius, 5.56 moles of ammonia are place din a 2.00-L vessel and allowed to decompose to the elements. 2NH_3_(g) N_2_(g) + 3H_2_(g)
Hydrogen gas was cooled from 150C to 50 C. It's new volume is75 mL. What was it's original volume?
A certain person had a brain that weighed 1.40 kg and contained 4.60 x 10^10 cells. Assuming that each cell was completely filled with water (density = 1.00 g/mL) calculate the length of one side of such a cell if it were a cube.
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