Calculation of mass from mole and volume — lesson. Science State Board, Class 10.

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எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்

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1.	Calculate the mass of $0.3$ $mole$ of aluminium (atomic mass of $Al=27$ ).

Data:

Given moles of aluminium

$= 0.3$

$mole$

Atomic mass of aluminium

$= 27$

Formula:

$\begin{array}{l} Number of moles = \frac{Mass of Al}{Atomic mass of Al} \\ Mass of Al = Number of moles \times Atomic mass of Al \end{array}$

Solution:

By substituting the values to the above formula, we get,

$\begin{array}{l} Mass of Al & = & 0.3 \times 27 \\ = & 8.1 g \end{array}$

Hence, the mass of

$0.3$

$mole$ of aluminium

$=8.1$

$g$

2.	Calculate the mass of $2.24$ $litre$ of $SO_2$ gas at STP.

Data:

Given volume of

$SO_2=2.24$

$L$

Atomic mass of

$S=32$

Atomic mass of

$O=16$

Solution:

$\begin{array}{l} Molecular mass of {SO}_{2} & = & 32 + (16 \times 2) \\ = & 32 + 32 \\ = & 64 \end{array}$

$Number of moles of {SO}_{2} = \frac{Given volume of {SO}_{2} at STP}{Molar volume of {SO}_{2} at STP}$

By substituting the values in the above formula, we get,

$\begin{array}{l} Number of moles of {SO}_{2} & = & \frac{2.24}{22.4} \\ = & 0.1 mole \end{array}$

$\begin{array}{l} Number of moles & = & \frac{Mass}{Molecular mass} \\ Mass & = & Number of moles \times Molecular mass \\ = & 0.1 \times 64 \\ = & 6.4 g \end{array}$

Hence, the mass of

$2.24$

$litre$ of

$SO_2=6.4$

$g$

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4. Calculation of mass from mole and volume

Theory: