What is the percent composition by mass for sodium (Na) in sodium phosphate (Na3PO4)? % Na = (/)x100% = ___% NNA

Question

asked Jun 24, 2021 21.4k views

1 Answer

Daniel Lyons · Answer 1 · 2021-06-30T19:16:57+0000

The percent composition by mass for sodium (Na) in Sodium phosphate (Na₃PO₄) : 42.07%

Given

Compound of Sodium phosphate (Na₃PO₄)

Required

The percent composition by mass for sodium (Na)

Solution

The Comparative Law (Proust ) : compounds are formed from elements with the same Mass Comparison

MW Na₃PO₄ = 163,94 g/mol

Ar Na=22,989769g/mol

$\tt \%mass~Na=(3.Ar~Na)/(MW~Na_3PO_4)* 100\%\\\\\%mass~Na=(3* 22.99)/(163.94)* 100\%\\\\\%mass~Na=42.07\%~Na$