Question

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

Answer 1

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

Further explanation

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`