Question

2. What is the percentage by mass of sodium (Na) in a formula unit of sodium
hydrogen carbonate (NaHCO3)?

Answer 1

The percentage by mass of sodium (Na) in a formula unit of sodium hydrogen carbonate (NaHCO3) is :

Formula:

Percent by mass of an element =(Total mass of the element in the formula / formula weight ) * 100

Step 1 :

Formula weight of NaHCO₃

The atomic masses of the elements Na, H,C and O

• Formula weight of NaHCO₃ = Na+H+C+3O
• Formula weight of NaHCO₃ = 22.9+1.01+12.01+3(16)
• Formula weight of NaHCO₃ is 84.01 g

Step 2 :

Use percent by mass formula

• Percent by mass of oxygen = (total mass of oxygen / formula weight) * 100
• Percent by mass of oxygen = 3(16/)84.01*100
• Percent by mass of oxygen = 57.14%

Thus, the percentage by mass of oxygen in a formula unit of sodium hydrogen carbonate (NaHCO3) is 57.14%.

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