Calculate the number of moles present in 32 g of Sulphur dioxide?

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Solution

The gram molecular mass or molar mass is defined as the molecular mass of a mole of a substance expressed in grams.
Number of moles can be calculated by the equation
Number of moles = $\frac{Given mass of the substance}{Molecular weight of the substance}$
To find the number of moles present in 32g of Sulphur dioxide(SO₂)
The given mass of Sulphur dioxide(SO₂) = 32g
Molecular weight of Sulphur dioxide(SO₂) = Molecular weight of Sulphur(S) + Molecular weight of Oxygen(O₂)
= 32 + (2×16)
= 64 g/mol.
Therefore, number of moles present in 32g of SO₂ = $\frac{32}{64}$ = 0.5 moles.
Hence, number of moles present in 32g of SO₂is 0.5moles.

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Similar questions

(a) A flask contains 3.2 g of sulphur dioxide. Calculate the following :
(i) The moles of sulphur dioxide present in the flask.
(ii) the number of molecules of sulphur dioxide present in the flask.
(iii) the volume occupied by 3.2 g of sulphur dioxide at STP.
(S = 32, O = 16)
(b) A n experiment showed that in a lead chloride solution 6.21 g of lead is combined with 4.26 g of chlorine. What is the empirical formula of this chloride?
(Pb = 2107; Cl = 35.5).

(a) A flask contains 3.2 g of sulphur dioxide. Calculate the following:
(i) The moles of sulphur dioxide present in the flask.
(ii) The number of molecules of sulphur dioxide present in the flask.
(iii) The volume occupied by 3.2 g of sulphur dioxide at STP. (S = 32, O = 16)

(b) The reaction of potassium permanganate (VII) with acidified iron (II) sulphate is given below:
2KMnO₄ + 10FeSO₄ + 8H₂SO₄ $\overset{}{\to}$ K₂SO₄ + 2MnSO₄ + 5Fe₂(SO₄)₃ + 8H₂O
If 15.8 g of potassium permanganate (VII) was used in the reaction, calculate the mass of iron (II) sulphate used in the above reaction. (K = 39, Mn = 55, Fe = 56, S = 32, O = 16)

Calculate the number of molecules in 12.8 g of sulphur dioxide gas. Take Avogadro's number as 6 × 10²³.
[S = 32, O = 16]

Calculate the mass of
(i) 10²² atoms of sulphur,
(ii) 0.1 mole of carbon dioxide.

[Atomic mass: S = 32, C = 12 and O = 16 and Avogadro's Number = 6 × 10²³]

A flask conntains 3.2g of sulphur dioxide calculate the following

1.the moles of sulphur dioxide present inthe flask

2.the number of molecules of sulphurdioxide present in the flask

3 the volume occupied by 3.2g of sulphur dioxide at s.t.p[s=32,o=16]

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