IDNLearn.com provides a user-friendly platform for finding and sharing accurate answers. Get the information you need from our experts, who provide reliable and detailed answers to all your questions.

The gram formula weight of phosphoric acid is 98.00 g/mol, and the density of 85.0% phosphoric acid is 1.685 g/mL. Could you describe how ...

Sagot :

formula weight of phosphoric acid is 98.00g/mol, because:
mass of H = 1g
mass of O = 16g
mass of P = 31g
mass of H3PO4 = 3*1g + 31g + 4*16g = 98g/mol
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
the density of 85% phosphoric acid is 1.685g/ml, so:
85% >>> we've 85g of phosphoric acid in 100g of solution (85g of acid; 100g-85g = 15g of water) 
1.685g/ml >>> we've 1.685g of phosphoric acid solution in 1ml

when we dissolve 85g of phosphoric acid in 15g of water, we obtain 85% phosphoric acid which density is 1.685g/ml