Dilution of a 0.005M standard solution of a compound is prepared by taking 2.00 mL of this solution and diluting with solvent to 25.00 mL. The diluted standard had an absorbance of 0.624 at 238 nm in a 1.00 cm cuvet. A blank solution containing only solvent had an absorbance of 0.029 at 238 nm. The absorbance of an unknown sample of this compound in the same solvent and cuvet had an absorbance of 0.377. • Calculate a) The concentration of the compound in this sample b) The molar absorptivity of this compound at 238 nm​

Ineed with my science work! it’s due tomorrow!

The diagram below shows the movement of particles. what does this piece of evidence best support? the collision theory the maxwell-boltzmann distribution the effect of pressure on reaction rates the effect of temperature on reaction rates

Answer asap need by wednesday morning explain how a buffer works, using an ethanoic acid/sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.