How many moles are in 100g of H2PO4?

Answer 1

One molecule of P2O3 = 1 mole. Go to the Periodic Table P = 30gm x 2 = 60 gm. O= 16 gm x 3 = 48 mg. Total is 60 + 48 = 108 gm is the weight of one molecule which is also the number of grams in 1 mole (remember 1 mol = 1 mole). So since you have 37.9 grams divide this by 108 and you have .35 moles.

Answer 2

Using the periodic table we can find the molecular weight of H3PO4:

for hydrogen: 3*1.01 g/mol = 3.03

for phosphorus: 1*30.97 g/mol = 30.97

for oxygen: 4*16.00 g/mol = 64.00

Adding these all up you get 98.0 g/mol

Now divide the mass of 37.1 g by the molecular weight of 98 g/mol to get the number of moles. In this case: 0.38 moles of H3PO4

Answer 3

Each mole P4O10 needs 6 moles of water to form (4 moles of) H3PO4 to balance the equation:

P4O10 + 6H2O --> 4H3PO4

so for 71.0 g P4O10 it comes to:

71.0(g P4O10) / 98.0(g P4O10/mol P4O10) = 0.724 mol P4O10

and this needs 6*0.724 = 4.35 mole H2O

Answer 4

The molar mass of H3PO4 is approximately 98 g/mol.

If you have 9.17 grams of H3PO4 then by unit analysis we have to divide by the molar mass to cancel grams and to find moles.

9.17 (grams) / 98 (grams/mol) = .0936 mol H3PO4

Answer 5

M = 3(1.0) + 31 + 4(16) = 98 g/mol

n = 5 g x (1 mol/98 g) =0.051 mol

Answer 6

H3PO4 is phosphoric acid, H2PO4 is an ion and would need another ion.

H3PO4 has a molar mass of 98g/mole. 100g x 1mole/98g = 1.02 mole

Answer 7

0.306 moles H3PO4

Answer 8

The answer is 0,306 moles.

Answer 9

The answer is 0,003 mol.