Half life of a reaction

Sucrose decomposes in acid solution, according to the first order rate law, to give Glucose and fructose. If the half life for the reaction is 3.33 hours at 25 degree celcius, what fraction of a sample of sucrose would remain after 9 hours ?

Kinetic energy about a released electron

The work function of an element is the energy required to remove an electron from the surface of the solid. The work function for cadmium is 378.2 kJ/mol (that is, it takes 378.2 kJ of energy to remove 1 mol of electrons from 1 mol of Cd atoms on the surface of a sample of cadmium.) What is the maximum wavelength of light that c ...continues

Identify the n initial and n final

One of the hydrogen emission lines has a wavelength of 486.0 nm. Identify the values for n initial and n final for the transition giving rise to this line. (Enter as two integers, separated by a comma: e.g. 2,1 or 3,2 etc.)

calculate wavelength of light that is absorbed in a transition from n=5 to n=6 in Be3+?

Calculate the wavelength of the light that is absorbed for the electron's transition from n=5 to n=6 in Be3+ ion. (ans in nm.)

Net ionic equation

correct balanced net ionic equation for each of the following reactions, occuring in aqueous solution. (i) CuSO4 + CaCl2 --> CuCl2 + CaSO4 (ii) 2HCl + Mg --> H2 + MgCl2 (iii) Br2 + 2NaI --> 2NaBr + I2

what is the concentration of (C2 4H3 8O4 ) in parts per billion?

A 1.80-mg sample of dioctyl phthalate (C24H38O4), a plasticizer, is dissolved in H2O to give 550mL of solution. What is the concentration of dioctyl phthalate in parts per billion?

Bohr's model type of equation

One of the hydrogen emission lines has a wavelength of 486.0 nm. Identify the values for ninitial and nfinal for the transition giving rise to this line. (Enter as two integers, separated by a comma: e.g. 2,1 or 3,2 etc.) c:3.00E8 m/s h:6.63E-34Js R:2.18E-18J Please could you explain how you got the nfinal and the n i ...continues

Calculate wavelength of light that is absorbed in a transition from n=5 to n=6 in Be3+?

Calculate the wavelength of the light that is absorbed for the electron's transition from n=5 to n=6 in Be3+ ion. (ans in nm.) c:3.00E8 m/s h:6.63E-34 Js R:2.18E-18 J I am not sure is Be Z=4...0r Z=3... Could you show me the steps of how you solve this problem... Thank you

Find Kp and Kc given an equilibrium equation, T, and P and % dissociation.

2NOBr(g) + Br2(g) <----> 2BrNO(g) @ equilibrium. NOBr is 34% dissociated at 25degreesC and total pressure is 0.25 atm. Calculate Kp and Kc. I know how to get Kp and Kc with given # of moles @ equilibrium, but cannot figure out how to get it from the percent dissociation. I tried inputting various values that I thought wer ...continues

Finding the number of molecules of a virus

A certain strain of tobacco mosaic virus has Mm = 4 *10^7 kg/k mol. How many molecules of the virus are present in 1 cm^3 of a solution that contain0.1mg of virus per cm^3