If I have 5 moles of P4O6 (approx 1099.45 grams), what is the weight (in grams) of phosphorus in this compound? Please explain because I'm very confused.

Cent0rea88
Oct 6, 2018

#1**+2 **

Convert from moles into grams:

5 mol of P4O6 (tetraphosphorus(III) hexoxide)

Split the chemical formula P4O6 into a tally of its elements:

atom | tally

O | 6

P | 4

Using the atomic masses of the elements O (15.999 u) and P (30.973761998 u), calculate the total mass of each element in 1 molecule of P4O6:

atom | tally | atomic mass | mass in molecule

O | 6 | 15.999 u | 95.994 u

P | 4 | 30.973761998 u | 123.89504799 u

Calculate the molecular mass of P4O6 by adding the mass of each type of atom:

95.994 u + 123.89504799 u = 219.89 u

Since 1 u corresponds to 1 g/mol, the molar mass of P4O6 equals 219.89 g/mol. The number of grams equals the molar mass of P4O6 multiplied by the molar amount:

(5 mol) * 95.994 =479.97 grams of Oxygen + (5 mol)* (123.895 g/mol) =**619.475 grams of Phosphorus** =1,099.45 grams in 5 moles of P4O6

Guest Oct 6, 2018

edited by
Guest
Oct 6, 2018

#2**+2 **

P = 30 . 97696 x 4 = 123.9078

O=15.9994 x 6 =95.9964

123.9078 / (123.9078 +95.9964) * 1099.45 = 619.498 gm of P

ElectricPavlov
Oct 7, 2018