Question:
The volume of carbon dioxide gas evolved at S.T.P. by heating $7.3\, gm$ of $Mg \left( HCO _{3}\right)_{2}$ will be
The volume of carbon dioxide gas evolved at S.T.P. by heating $7.3\, gm$ of $Mg \left( HCO _{3}\right)_{2}$ will be
Updated On: Aug 1, 2022
- 2240 ml
- 1120 ml
- 2340 ml
- 2000 ml.
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The Correct Option is B
Solution and Explanation
$Mg\left(HCO_{3}\right)_{2} \to MgO + 2CO_{2} + H_{2}O$
$146 \,g$ give $22.4$ Litre of $CO_{2}$
$\Rightarrow 7.3 \,g$ will give $= \frac{22.4}{146}\times7.3$
$\Rightarrow = 1.12$ litre of $CO_{2}$
$= 1120\, ml$ of $CO_{2}$
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Concepts Used:
Gas Laws
The gas laws were developed at the end of the 18th century, when scientists began to realize that relationships between pressure, volume and temperature of a sample of gas could be obtained which would hold to approximation for all gases.
The five gas laws are:
- Boyle’s Law, which provides a relationship between the pressure and the volume of a gas.
- Charles’s Law, which provides a relationship between the volume occupied by a gas and the absolute temperature.
- Gay-Lussac’s Law, which provides a relationship between the pressure exerted by a gas on the walls of its container and the absolute temperature associated with the gas.
- Avogadro’s Law, which provides a relationship between the volume occupied by a gas and the amount of gaseous substance.
- The Combined Gas Law (or the Ideal Gas Law), which can be obtained by combining the four laws listed above.