The molecular weight of a compound refers to the sum of the atomic weights of all the atoms in one molecule of that compound. Determining the molecular weight is crucial for various chemical calculations and understanding the properties of a substance. This article delves into the molecular weight of benzanilide, exploring its significance and providing practical information.
Benzanilide (C6H5CONHC6H5) is an organic compound belonging to the amide functional group. It is a white crystalline solid with a faint odor and low solubility in water. Benzanilide is commonly used as an intermediate in the synthesis of other organic compounds, such as pharmaceuticals, dyes, and plastics.
The molecular weight of benzanilide is calculated by adding the atomic weights of its constituent atoms:
Total molecular weight: 72.066 amu + 10.080 amu + 14.007 amu + 16.000 amu = 183.153 amu
According to the PubChem database, the exact molecular weight of benzanilide is 183.2094 amu. This value considers the isotopic distribution of the elements involved.
Knowing the molecular weight of benzanilide is important for several reasons:
Table 1: Atomic Weights of Elements in Benzanilide
Element | Atomic Weight (amu) |
---|---|
Carbon (C) | 12.011 |
Hydrogen (H) | 1.008 |
Nitrogen (N) | 14.007 |
Oxygen (O) | 16.000 |
Table 2: Molecular Weight of Benzanilide
Calculation | Molecular Weight (amu) |
---|---|
Sum of Atomic Weights | 183.153 |
Exact Molecular Weight (PubChem) | 183.2094 |
Table 3: Properties of Benzanilide
Property | Value |
---|---|
Molecular Weight | 183.2094 amu |
Appearance | White crystalline solid |
Melting Point | 164-166 °C |
Boiling Point | 288-290 °C |
Solubility in Water | 0.3 g/100 mL |
Story 1: The Misidentified Amide
A chemist was working on a project involving the synthesis of an amide. After completing the reaction, they sent the product to be analyzed by mass spectrometry. However, the results indicated a molecular weight that did not match any known amides. After much investigation, it was discovered that an error had occurred during reagent preparation, and the compound synthesized was not an amide at all.
What We Learn: It is always important to double-check the identity of chemicals before using them in reactions.
Story 2: The Lost Solvent
A student was performing a purification step that involved dissolving the crude product in a solvent. After filtration, the solvent was evaporated, but the mass of the resulting product was significantly lower than expected. It was later discovered that the solvent had been inadvertently poured out along with the filtrate.
What We Learn: Always use a clean funnel for filtration and be aware of how much solvent you are using.
Story 3: The Overlooked Decimal Point
A researcher was working on a project that required precise stoichiometry. While calculating the amount of reagent to use, they accidentally overlooked a decimal point in the molecular weight of benzanilide. As a result, they added an incorrect amount of reagent, leading to an incorrect reaction yield.
What We Learn: Pay close attention to units and decimal points when performing calculations.
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The molecular weight of benzanilide, 183.2094 amu, plays a crucial role in chemical calculations and understanding its properties. By accurately determining molecular weight, researchers and chemists can optimize reactions, analyze data, and ensure the quality and purity of their products. This article provides comprehensive information on the molecular weight of benzanilide, emphasizing its significance and guiding readers on how to avoid common pitfalls.
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