Question

Determine the number of moles of aluminum in 2. 154 x 10-1 kg of al.

Answer 1

The moles are the estimation of the quantities like the molecules and the atoms. There are 7.984 moles of aluminum present in the 2.154 × 10⁻¹ kg substance. Thus, option b is correct.

What are moles?

The moles give the estimation of the smaller entities by the ratio of mass or weight to the molar mass of the substance.

The formula for moles is given as,

Moles = mass ÷ molar mass

Given,

Mass of aluminium = 2.154 × 10⁻¹ kg = 2.154 × 10² gm

Molar mass of Al = 26.9 g/mol

Substituting values above:

Moles = 2.154 × 10² gm ÷ 26.9 g/ mol

= 7.984 mol

Therefore, option. 7.984 moles of aluminum are present.

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