Achemistry student needs 65.0g of diethylamine for an experiment. by consulting the crc handbook of chemistry and physics, the student discovers that the density of diethylamine is ·0.706gcm−3. calculate the volume of diethylamine the student should pour out.

The student should pour out 92.068 cm³ of diethylamine.

Explanation:

The equation for density is:  

We are given the density and mass of a liquid and asked to calculate the

volume of the liquid. We rearrange the equation to give

v= 65.0 g÷0.706 g.cm³  = 92.068 cm³

The grams cancel, thus the unit left is cm³.

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.