Given below are a few samples.

a. 400 g of water (H₂O)

b. 400 g of carbon (C)

c. 400 g of helium (He)

d. 400 g of hydrogen (H₂)

e. 400 g of glucose (C₆H₁₂O₆)

(i) Find the number of moles in each.

(ii) Arrange the samples in the increasing order of their number of moles.

(Gram molecular masses He = 4 g, C = 12 g, H₂ = 2 g, H₂O = 18 g, C₆H₁₂O₆ = 180 g)

One mole: The amount of any substance containing 6.022 × 10²³ particles is called one mole.

a. Given: Mass of water = 400g

Gram molecular mass (GMM) of H₂O = 18g

Apply the formula:

Number of moles = 22.2

Thus, number of moles of the given sample is 22.2

b. Given: Mass of carbon = 400g

Gram molecular mass (GMM) of carbon = 12g

Apply the formula:

Number of moles = 33.3

Thus, number of moles of the given sample is 33.3

c. Given: Mass of helium = 400g

Gram molecular mass (GMM) of He = 4g

Apply the formula:

Number of moles = 100

Thus, number of moles of the given sample is 100

d. Given: Mass of hydrogen = 400g

Gram molecular mass (GMM) of H₂ = 2g

Apply the formula:

Number of moles = 200

Thus, number of moles of the given sample is 200

e. Given: Mass of glucose = 400g

Gram molecular mass (GMM) of C₆H₁₂O₆ = 180 g

Apply the formula:

Number of moles = 2.22

Thus, number of moles of the given sample is 2.22

ii) Arrangement of the samples in the increasing order of their number of moles is:

Glucose < Water <Carbon < Helium < Hydrogen