Practice Questions

The ratio of H₂O to CO₂ is 3:2. Therefore, 3 moles of CO₂ correspond to 4.5 moles of H₂O.

OH⁻ contains eight electrons from oxygen, one from hydrogen, and one extra electron due to the negative charge.

One mole of phosphorus molecules requires five moles of oxygen. Therefore, 0.25 mole requires 1.25 moles.

One methane molecule contains ten protons. Thus, one mole contains 10 × Avogadro's number of protons.

Actual yield equals 80% of theoretical yield. Therefore, 0.80 × 5 = 4 moles.

One atomic mass unit is defined as one-twelfth the mass of a carbon-12 atom.

Sixty-four grams of SO₂ equal one mole, producing one mole of SO₃.

The molar mass divided by Avogadro's number gives the mass of one molecule.

Half a mole of CO₂ occupies 11.2 dm³ at STP.

The sample contains 0.25 mole of CO₂. Since one mole weighs 44 g, the mass is 11 g.