Question

Calculate the weight of sulphur present in 1.5 moles of hydrogen sulphate.
A. 48g
B. 50g
C. 60g
D. 70g

Answer 1

Hint: As we know, mole of a substance is used to measure the amount of that substance and one mole of a substance is the quantity identical to the substance’s atomic or molecular mass or weight. So, from the number of moles given, the weight of the sulphur atom can be easily calculated using the direct formula of one mole.


Complete step by step solution:
As per the given question, the data given are:
Number of moles of hydrogen sulphide is 1.5 moles.
The chemical formula of hydrogen sulphide is ${{H}_{2}}S$.
The following chemical reaction shows a balanced chemical reaction forming hydrogen sulphide,
${{H}_{2}}+{{S}_{2}}\to {{H}_{2}}S$
So, as per the reaction we observe that,
One mole of sulphur is giving one mole of hydrogen sulphide.
Therefore,
If one mole of hydrogen sulphide is giving one mole of sulphur.
Then, 1.5 moles of hydrogen sulphide will give $=\dfrac{1.5\times 1}{1}=1.5moles$of sulphur.
As we know, one mole of a substance is defined as Avogadro’s number of some chemical unit, be it atoms, molecules, ions, or others. It is a convenient unit used to measure the mass of a substance and one mole of a substance is the quantity identical to the substance’s atomic or molecular weight.
Hence here, the weight of 1.5 moles of sulphur (as calculated above) will be,
The atomic weight of sulphur is 32 grams.
So, one mole of sulphur will weigh 32 grams.
Thus, 1.5 moles of sulphur will weigh $1.5\times 32grams=48grams$.

Hence, the correct option is A.


Note: One mole of a substance is equal to \[6.022\times {{10}^{23}}\]units of that substance which may be atoms, molecules, or ions (the number \[6.022\times {{10}^{23}}\]is known as Avogadro’s number. In short, we can say that one mole of a substance is the quantity identical to the substance’s atomic or molecular mass or weight.