Question:
What is the quantity of hydrogen gas liberated when $46 \,g$ sodium reacts with excess ethanol ? (Given At. mass of Na = 23)
What is the quantity of hydrogen gas liberated when $46 \,g$ sodium reacts with excess ethanol ? (Given At. mass of Na = 23)
Updated On: May 15, 2024
- $2.4 \times 10^{-3} kg $
- $2.0 \times 10^{-3} kg $
- $4.0 \times 10^{-3} kg $
- $2.4 \times 10^{-2} kg $
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The Correct Option is B
Solution and Explanation
$2 Na +2 C _{2} H _{5}- OH \rightarrow 2 C _{2} H _{5}- ONa + H _{2}$
Moles of $46\, g\, Na =\frac{46\, g }{23\, g / mol }=2\, mol$
2 moles of Na will give 1 mole of hydrogen.
The molecular weight of hydrogen is $2\, g / mol$.
Thus the quantity of hydrogen gas liberated is $2.0\, g$ or $2.0 \times 10^{-3} kg$
Moles of $46\, g\, Na =\frac{46\, g }{23\, g / mol }=2\, mol$
2 moles of Na will give 1 mole of hydrogen.
The molecular weight of hydrogen is $2\, g / mol$.
Thus the quantity of hydrogen gas liberated is $2.0\, g$ or $2.0 \times 10^{-3} kg$
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Concepts Used:
Alcohols
What is Alcohol?
Alcohol is a derivative of water (H2O) that has one, two, or more hydroxyl groups that are attached to a carbon atom of a hydrocarbon chain (an alkyl group). It is one of the most common organic compounds used in sweeteners, fragrances, and medicine.
Read More: Types of Alcohol
Uses of Alcohol:
- Ethanol is the alcohol used in alcoholic drinks. It can be used as an industrial methylated spirit where methanol is used very little in quantity as it can be dangerous.
- It is used as fuel to produce carbon dioxide and water by the process of fermentation. Whereas methanol burns carbon dioxide and water to facilitate combustion.
- Alcohol is an organic compound used as a solvent that is insoluble in water.
- It can be used to lower the level of sugar.
- Alcohol is used as a preservative in laboratories.