Evaluate the following expression using the values given:

find 4x − y − 2z if x = −2, y = 3, and z = −2

−15
15
−7
7

The concentration of a benzene solution is 4.05 molal

Explanation:

Molality of a solution is defined as the number of moles of solute dissolved per kg of the solvent.

where,

n = moles of solute

= weight of solvent in g

moles of =

Now put all the given values in the formula of molality, we get

Therefore, the concentration of a benzene solution is 4.05 molal