PDF chapter test TRY NOW

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 \(SO_2=\)

Did you find an error?