Question

Calculate the percent composition by mass of H,P,and O in phosphoric acid (H3PO4)

Answer 1

Explanation:

Mass percentage = Mass of the element ÷molar mass×100

Answer 2

Percentage of H= 3.06%,

Percentage of P = 31.63%,

Percentage of O = 65.31%

Percent composition by mass = $\frac{Mass of the element in 1 mole of compound}{Molar mass of the compound}$×100

Molar mass of Phosphoric acid $H_{3}PO_{4}$ = 3(1)+1(31) +4(16)

$H_{3}PO_{4}$= 3 + 31 + 36

$H_{3}PO_{4}$  = 98 $gmol^{-1}$

Percentage of H = $\frac{3}{98}$ ×100 = 3.06%

Percentage of P = $\frac{31}{98}$ ×100 = 31.63%

Percentage of O = $\frac{64}{98}$ ×100 = 65.31%

Percent composition by mass of H,P,and O in phosphoric acid is 3.06%,  31.63%,  65.31%

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