Question

Calculate the number of moles and number of molecules of sugar (C12H22O11) present in 171 g of sugar

Answer 1

Explanation:

The number of moles is the ratio of mass to molar mass.

Moles of Sugar =

342

1.71

=

200

1

mol

The number of molecules is the product of the number of moles and Avogadro's number N

A

=6.023×10

23

.

Number of molecules =

200

1

×N

A

Number of C atoms = 12×

200

1

×N

A

=3.6×10

22

Answer 2

Number of moles = 0.5 moles

Number of moles = 0.5 moles Number of Molecules = 3.02 × 10²³

GIVEN

Weight of C₁₂H₂₂O₁₁ = 171 grams

TO FIND

Number of moles and number of molecules present in 171 grams of C₁₂H₂₂O₁₁

SOLUTION

We can simply solve the above problem as follows-

Molecular mass of C₁₂H₂₂O₁₁ = 342 g/mol

We know that,

Moles = Given weight/molecular weight

So,

Number of moles C₁₂H₂₂O₁₁ = 171/342 = 0.5 moles

We know that,

1 mole of a substance = 6.022×10²³ molecules of the substance.

Therefore,

0.5 moles of sugar = 6.022×10²³ × 0.5 = 3.02 × 10²³ molecules.

Hence,

Hence,Number of moles = 0.5 moles

Hence,Number of moles = 0.5 moles Number of Molecules = 3.02 × 10²³

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