Molecular mass and the mole · आण्विक द्रव्यमान और मोल
Add up atomic masses, then turn grams into moles and moles into particles.
Molecular mass and the mole games
Molecular mass आण्विक द्रव्यमान
Add the atomic masses of all the atoms in the formula. Atomic masses used here: H 1, C 12, N 14, O 16, Na 23, Mg 24, Al 27, S 32, Cl 35.5, K 39, Ca 40 (in u).
Example: H₂SO₄ = 2 × 1 + 32 + 4 × 16 = 98 u. CaCO₃ = 40 + 12 + 3 × 16 = 100 u.
The mole मोल
| 1 mole | 6.022 × 10²³ particles (Avogadro's number) |
| Molar mass | molecular mass in grams (H₂O: 18 g) |
| Moles | mass ÷ molar mass |
| Particles | moles × 6.022 × 10²³ |
Example: 36 g of water = 36 ÷ 18 = 2 moles = 2 × 6.022 × 10²³ = 12.044 × 10²³ molecules. Also see structure of the atom, writing chemical formulae and balancing equations.
Goes with NCERT Science Class 9, Chapter Atoms and Molecules (and Class 11 Chemistry, Unit 1). Atomic masses rounded as in NCERT.
A one-page chart to stick on the wall, and a worksheet to practise.
Molecular mass and the mole
Molecular mass आण्विक द्रव्यमान
Add the atomic masses of all the atoms in the formula. Atomic masses used here: H 1, C 12, N 14, O 16, Na 23, Mg 24, Al 27, S 32, Cl 35.5, K 39, Ca 40 (in u).
Example: H₂SO₄ = 2 × 1 + 32 + 4 × 16 = 98 u. CaCO₃ = 40 + 12 + 3 × 16 = 100 u.
The mole मोल
| 1 mole | 6.022 × 10²³ particles (Avogadro's number) |
| Molar mass | molecular mass in grams (H₂O: 18 g) |
| Moles | mass ÷ molar mass |
| Particles | moles × 6.022 × 10²³ |
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Molecular mass and the mole — worksheet
Name: ____________________ Class: ______ Date: __________
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