Multiple Choice
What is the approximate percent by mass of potassium (K) in potassium bicarbonate (KHCO3)?
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3. Chemical Reactions
Mass Percent
Multiple Choice
What is the mass percent of sodium (Na) in sodium hydrogen carbonate (NaHCO_3)?
A
27.4%
B
43.4%
C
15.2%
D
52.0%
Verified step by step guidance1
Identify the chemical formula of sodium hydrogen carbonate, which is NaHCO\_3, and list the elements present: sodium (Na), hydrogen (H), carbon (C), and oxygen (O).
Find the atomic masses of each element from the periodic table: Na = 22.99 g/mol, H = 1.01 g/mol, C = 12.01 g/mol, and O = 16.00 g/mol.
Calculate the molar mass of sodium hydrogen carbonate by summing the atomic masses of all atoms in the formula: \(M = M_{Na} + M_H + M_C + 3 \times M_O\).
Calculate the mass percent of sodium by dividing the atomic mass of sodium by the molar mass of sodium hydrogen carbonate and multiplying by 100%: \(\text{Mass \% Na} = \left( \frac{M_{Na}}{M} \right) \times 100\%\).
Interpret the result to determine the mass percent of sodium in sodium hydrogen carbonate, which will help you select the correct answer from the given options.
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