MCQs

One mole always contains 6.022 × 10²³ elementary particles.

The balanced equation directly provides the ratio.

This represents 0.5 mole of water. Half of 18 g equals 9 g.

Stoichiometric calculations depend entirely upon balanced mole ratios.

Each mole of sucrose contains 12 moles of carbon atoms. Therefore, two moles contain 24 moles.

The mole ratio Al:Cl₂ is 2:3. Therefore, 5 moles of aluminium require 7.5 moles of chlorine.

Every mole contains the same number of molecules, although the number of atoms differs.

Stoichiometric coefficients indicate mole relationships among reactants and products.

One mole of Fe₂O₃ produces two moles of iron. Two × 55.85 g equals 111.7 g.

Each formula unit contains three ions. Therefore, one mole contains three times Avogadro's number of ions.

Hydrogen and water have a 1:1 mole relationship in the balanced equation.

Half a mole contains half of Avogadro's number of molecules.

Six moles of water are formed from four moles of ammonia. The ratio simplifies to 3:2.

Since one mole contains Avogadro's number of atoms, dividing the molar mass by this constant gives the mass of one atom.

Every mole contains 6.022 × 10²³ particles regardless of the substance.

One mole of propane requires 5 moles of oxygen. Therefore, 2 moles require 10 moles of oxygen.

The balanced equation shows that 1 mole of nitrogen reacts with 3 moles of hydrogen, giving a mole ratio of 1:3.

Digestive enzymes are secreted as inactive zymogens to protect tissues from self-digestion.

Most φ and ψ angle combinations are sterically forbidden for amino acids other than glycine.