12. Which has the highest mass
1. 2 moles of sodium
2.5 moles of water
3.12 gm of carbon
4.none of these
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Answers
Explanation:
option b
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Answer:
• The mole (or mol) represents a certain number of objects.
• SI def.: the amount of a substance that contains the same
number of entities as there are atoms in 12 g of carbon-12.
• Exactly 12 g of carbon-12 contains 6.022 x 10 23 atoms.
• One mole of H 2O molecules
contains 6.022 x 10 23 molecules.
• 1 mole contains 6.022 x 10 23 entities (Avogadro’s number)
Concept 1. The meaning and usefulness of the mole
2
• One mole of NaCl contains 6.022 x 10 23 NaCl formula units.
• Use the mole quantity to count formulas by weighing them.
• Mass of a mole of particles = mass of 1 particle x 6.022 x 1023
• The mass of an atom in amu is numerically the same
as the mass of one mole of atoms of the element in grams.
• One atom of sulfur has a mass of 32.07 amu;
one mole of S atoms has a mass of 32.07 g.
Mass of 1 H atom: 1.008 amu x 1.661 x10-24 g/amu = 1.674 x10-24 g
Mass of 1 mole of H atoms:
1.674 x10-24g/H atom x 6.022 x1023H atoms = 1.008 g
PT
3
• For compounds, the molecular mass (in amu) is numerically
the same as the mass of one mole of the compound in grams.
• Skill 3-1 Calculate the molecular mass of a compound as the
sum of the atomic masses of its elements.
• Molecular mass H2O = (2 x atomic mass of H) + atomic mass of O
= 2(1.008 amu) + 16.00 amu = 18.02 amu
• So, one mole of water (6.022 x 10 23 molecules) has a mass of 18.02 g.
• Molar mass of NaCl = atomic mass of Na (22.99 amu) +
the atomic mass of Cl (35.45 amu) 22.99 + 35.45 = 58.44 amu
• One mol of NaCl (6.02 x1023 formulas) has a mass of 58.44 g.
Concept 2. The relation between molecular (formula) mass
and molar mass
4
• To obtain one mole of copper atoms (6.02 x 10 23 atoms),
Explanation:
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