What is function for phosphoric acid?
non-volatile, rather viscous, syrupy liquids, but still pourable. Phosphoric acid is very commonly used as an aqueous solution of 85% phosphoric acid or H3PO4.
Phosphoric acid has the formula H3PO4 so if you add up these numbers from the periodic table you find the Molar mass of phosphoric acid is 98 (1+1+1+31+16+16+16+16). this is the mass (in grams) of one mol of phosphoric acid (or 6.02 x 10^23 atoms of phosphoric acid) So times this number by 0.4 to find the mass of 0.4mol of phosphoric acid=39.2 grams