What is the mass of—(a) 1 mole of nitrogen atoms?(b) 4 moles of aluminium atoms (Atomic mass of aluminium = 27)?(c) 10 moles of sodium sulphite (Na2SO3)?

To find the mass of the given quantities, we use the concept of molar mass. The molar mass is the mass of one mole of a substance and is numerically equal to the atomic or molecular mass in grams per mole (g/mol).

(a) Mass of 1 Mole of Nitrogen Atoms

The atomic mass of nitrogen (N) is 14 u (atomic mass unit).

• Mass of 1 mole of nitrogen atoms = 14 grams

(b) Mass of 4 Moles of Aluminium Atoms

The atomic mass of aluminium (Al) is 27 u.

• Mass of 1 mole of aluminium atoms = 27 grams
• Mass of 4 moles of aluminium atoms = 4×27 grams = 108 grams

(c) Mass of 10 Moles of Sodium Sulphite (Na₂SO₃)

First, we need to find the molar mass of sodium sulphite (Na₂SO₃).

• Sodium (Na) atomic mass = 23 u
• Sulfur (S) atomic mass = 32 u
• Oxygen (O) atomic mass = 16 u

Molar mass of Na₂SO₃ = 2×23 (for Na) + 1×32 (for S) + 3×16(for O) = 46+32+48=126 grams/mole

• Mass of 10 moles of sodium sulphite = 10×12610 \times 12610×126 grams = 1260 grams

So, the masses are:

• (a) 1 mole of nitrogen atoms = 14 grams
• (b) 4 moles of aluminium atoms = 108 grams
• (c) 10 moles of sodium sulphite = 1260 grams

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