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21. Intext problems: Calculation of mass from mole I

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:

Mass of aluminium

$=$

Solution:

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

Mass of aluminium

$=$

Hence, the mass of

$0.3$

$mole$ of aluminium

$=$

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

$S=$ \

Atomic mass of

$O=$

Solution:

Molecular mass of

$SO_2$

$=$

Number of moles of

$SO_2$

$=$

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

Number of moles of

$SO_2$

$=$

Mass

$=$

Hence, the mass of

$2.24$

$litre$ of

$SO_2=$

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21. Intext problems: Calculation of mass from mole I

Exercise condition: