Q3.18P - Chemistry: Molecular Nature Of Matter And Change

Question

Calculate each of the following:

a). Mass % of H in ammonium bicarbonate

b). Mass % of O in sodium dihydrogen phosphate heptahydrate

Step-by-Step Solution

Answer

a). Mass % of H in ammonium bicarbonate is 6.39%

b). Mass % of O in sodium dihydrogen phosphate heptahydrate is 71.51%

Step 1: Definition of Mass

A property that reflects the quantity of matter within a sample is defined as mass

Step 2: Calculations

a. The molar   mass of ammonium bicarbonate is  $79.07\frac{g}{mol}$

Mass % of H  $=\frac{5molH\left(\frac{1.01gH}{molH}\right)}{79.07gN{H}_{4}HC{O}_3}\times 100$

Mass % of H is 6.39%

b.The molar   mass of sodium dihydrogen phosphate heptahydrate is  $\text{246.12}\frac{\text{g}}{\text{mol}}$

Mass % of O  $\text{=}\frac{\text{11mol\hspace{0.17em}H\hspace{0.17em}}\left(\frac{\text{16.00\hspace{0.17em}g\hspace{0.17em}O}}{\text{mol\hspace{0.17em}O}}\right)}{{\text{246.12\hspace{0.17em}g\hspace{0.17em}NaH}}_{\text{2}}{\text{PO}}_{\text{4}}{\text{.7H}}_{\text{2}}\text{O}}\text{×100}$

Mass % of O is 71.51%