One milligram of a compound of molecular weight 160 is dissolved in 10 ml of ethanol, and the solution is poured into a 1-cm uv cell. the uv spectrum is taken, and there is an absorption at = 247 nm. the maximum absorbance at 247 nm is 0.50. calculate the value of for this absorption.

The value of molar absorptivity of the compound is .

Explanation:

Using Beer-Lambert's law :

A = absorbance of solution

C = concentration of solution =

l = path length = 1.00 cm

= molar absorptivity coefficient

Moles of compound =

Volume of the solution = 10 mL = 0.010 L

A = 0.50 , l = 1 cm

The value of molar absorptivity of the compound is .

yes it is balanced

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.