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kotykmax [81]
3 years ago
15

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

Chemistry
2 answers:
nadezda [96]3 years ago
8 0

Percent by mass of an element can be calculated as

(Total mass of the element in the formula / formula weight ) * 100

Step 1 : Find formula weight of NaHCO₃

To find formula weight of NaHCO₃, we have to add atomic masses of the elements Na, H,C and O

Formula weight of NaHCO₃ = Na+H+C+3 (O)

Formula weight of NaHCO₃ = 22.99+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 = \frac{3(16)}{84.01} * 100

Percent by mass of oxygen = 57.14%

Answer : percentage by mass of oxygen in a formula unit of sodium hydrogen carbonate (NaHCO3) is 57.14%

Katen [24]3 years ago
7 0
((8×3)÷(11+1+6+16+(8×3)))×100
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