객관식
Which of the following solutions has the highest mass/volume percent (% m/v)?
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3. Chemical Reactions
Mass Percent
객관식
What is the percent by mass of sodium (Na) in sodium chloride (NaCl)? Use the atomic masses: Na = 22.99 g/mol, Cl = 35.45 g/mol.
A
22.99%
B
60.66%
C
39.34%
D
35.45%
검증된 단계별 안내1
Identify the atomic masses of the elements involved: sodium (Na) has an atomic mass of 22.99 g/mol, and chlorine (Cl) has an atomic mass of 35.45 g/mol.
Calculate the molar mass of sodium chloride (NaCl) by adding the atomic masses of sodium and chlorine: \(\text{Molar mass of NaCl} = 22.99 + 35.45\) g/mol.
Determine the percent by mass of sodium in sodium chloride using the formula: \(\text{Percent by mass of Na} = \left( \frac{\text{Atomic mass of Na}}{\text{Molar mass of NaCl}} \right) \times 100\%\).
Substitute the known values into the formula: \(\text{Percent by mass of Na} = \left( \frac{22.99}{22.99 + 35.45} \right) \times 100\%\).
Perform the division and multiplication to find the percent by mass of sodium in sodium chloride.
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