diphosphorous pentoxide is P2O5. You may determine the molar mass, which is 142 g/mol. Work out what number of moles of this you could have by dividing by the molar mass:

15.5g * ( 1mole/142g)= .109 moles P2O5

Since you could have .109 moles P2O5, you could have twice that many moles of phosphorus, as a result of theres 2 Ps in every molecule.

So you could have .218 moles phosphorus

Work out what number of grams thats by multiplying by the molar mass of P:

.218 moles * (31g/mole)= 6.77 grams P

I assume that is closest to D.

do it like this.

diphosphorous pentoxide is P2O5

from this periodic desk

www.chemicalelements.com/

the atomic mass of P is 30.97

the atomic mass of O is 16.00

so the mass of 1 P2O5 = 230.97 516.00 = 141.9

and the mass of the P in P2O5 = 2 x 30.97 = 61.9

so the fraction of P in P2O5 = 61.9 / 141.9

lastly

15.5 g P2O5 x (61.9 g P / 141.9 g P2O5) = 6.76 g P

Molar Mass Of Diphosphorus Pentoxide

diphosphorous pentoxide is P2O5. You may determine the molar mass, which is 142 g/mol. Work out what number of moles of this you could have by dividing by the molar mass:

15.5g * ( 1mole/142g)= .109 moles P2O5

Since you could have .109 moles P2O5, you could have twice that many moles of phosphorus, as a result of theres 2 Ps in every molecule.

So you could have .218 moles phosphorus

Work out what number of grams thats by multiplying by the molar mass of P:

.218 moles * (31g/mole)= 6.77 grams P

I assume that is closest to D.

P2O5 has a molar mass of 283.9 gms/mole

15.5 gms/283.9 gms/mole = 0.055 moles of P2O5

Since there are 2 moles of P for every mole of P2O5 you could have 20.055 moles of P = 0.11 moles of P

Atomic mass of P is 31 gm/mole

0.11 moles x 31 gms/mole = 3.41 gms of P.

I did a good bit of rounding, so it seems like the reply must be (b), 3.38 grams.

NOTE: I used the atomic mass of 283.9 as a result of thats for P4O10 which is the most typical type of phosphorous pentoxide. In the event you use 142, for P2O5 youll get reply (d). This is the reason theres confusion

diphosphorous pentoxide is P2O5. You may determine the molar mass, which is 142 g/mol. Work out what number of moles of this you could have by dividing by the molar mass:

15.5g * ( 1mole/142g)= .109 moles P2O5

Since you could have .109 moles P2O5, you could have twice that many moles of phosphorus, as a result of theres 2 Ps in every molecule.

So you could have .218 moles phosphorus

Work out what number of grams thats by multiplying by the molar mass of P:

.218 moles * (31g/mole)= 6.77 grams P

I assume that is closest to D.

This post is last updated on hrtanswers.com at Date : 1st of September – 2022