alleryStart learning →Sodium chloride is NaCl. With Na = 22.99 amu and Cl = 35.45 amu, what is its formula mass?
A12.46 amu
B58.44 amu
C45.98 amu
D70.90 amu
Answer & Solution
Correct answer: B. 58.44 amu
1. Sodium chloride combines sodium cations and chloride anions in a 1:1 ratio.
2. One sodium atom contributes 22.99 amu and one chlorine atom contributes 35.45 amu.
3. The formula mass is 22.99 + 35.45 = 58.44 amu.
4. The value 12.46 amu is the difference between the two atomic masses rather than their sum.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 3 "Composition of Substances and Solutions", section 3.1 Formula Mass and the Mole Concept_
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