Question

If you have 1.0 mol of each of the following compounds, which will have the greatest

mass?
OH3PO4
O NI3
O FeCl3
OKCI

Answer 1

NI3 has the highest molar mass = 394.707 grams

Step-by-step explanation:

1 mole of each substance contain mass which is equal to molar mass of the substance .

Molar mass is calculated in the same way the molecular mass is calculated.

The Molar mass id expressed in grams.

Molecular mass = Mass of the atom x the number of atoms

Atomic mass of H = 1.00 amu

O = 15.99 amu

P = 30.97 amu

`H_(3)PO_(4)` = 3(Mass of H) + 1(Mass of P) + 4(Mass of O)

= 3(1)+ 1(30.97) + 4(15.99)

= 3 + 30.97 + 63.96

= 97.93 gram

`NI_(3)` = 1 (mass of N) + 3(mass of I)

= 1(14.0067)+3(126.9)

= 394.7067 grams

`FeCl_(3)` = 1(atomic mass of Fe) + 3(atomic mass of Cl)

= 1(55.845)+3(35.45)

= 55.845 + 106.35

= 162.195 grams

KCl = 1(mass of K) + 1(mass of Cl)

= 1(39.09) + 35.45

= 74.54 gram

Out of these NI3 has the highest molar mass = 394.707 grams