What molality of nonvolatile solute is needed to lower the melting point of camphor by 1.010°c? (kf = 39.70ºc/m)?

Molality is defined as the ratio of moles of solute to the mass of solvent in Kg. It is also known as molal concentration.

Formula used for determining the molality is:

   (1)

where,

= change in temperature

= freezing point depression constant

m = molality

Here, = and =

Put the above values in formula (1)

=

Hence, molality of nonvolatile solute is

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.