Dear Tanuja,

P2O5 Mol. Wt=142

H3PO4 Mol.Wt. =98, therefor 2 X H3PO4= 2 X 98=196

For 142 P2O5 rqrd 196 H3PO4

For 100 g of P2 O5 rqrd 100 X 196/142 =138 g

But How much purity of H3PO4 ?

Suppose H3PO4 Purity 90 % then Net rqrd=1.1 X 138=151 gram.

Similarly others

Regards,

Prem Baboo

Thanks Prem Baboo sir for your time and your valuable reply.

i support the answer given by prem baboo

Thanks Prakash garu for your affirmation.

Also support the answer

Thank You too Zenzile