Calculate the weight/mass of :
(a) an atom of oxygen
(b) an atom of hydrogen
(c) a molecule of NH₃
(d) 10²² atoms of carbon
(e) 0.25 gram atom of calcium
Mole Concept
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Question

Calculate the weight/mass of : (a) an atom of oxygen (b) an atom of hydrogen (c) a molecule of NH₃ (d) 10²² atoms of carbon (e) the molecule of oxygen (f) 0.25 gram atom of calcium

KnowledgeBoat · Accepted Answer

(a) Number of oxygen atoms in 16 g of atomic oxygen = 6.022 × 10²³ atoms mass of 1 atom of oxygen = = 2.657 × 10^-23 g (b) Number of hydrogen atoms in 1 g of atomic hydrogen = 6.022 × 10²³ atoms Mass of 1 atom of hydrogen = = 1.666 × 10^-24 g (c) Gram molecular mass of NH₃ = 14 + 3 = 17 g Number of NH₃ molecules in 17 g of NH₃ = 6.022 × 10²³ molecules Mass of 6.022 × 10²³ molecules of NH₃ = 17g Mass of 1 molecule of NH₃ = = 2.823 × 10^-23 g (d) Mass of 6.022 × 10²³ atoms of atomic carbon = 12 g Mass of 10²² atoms of carbon = = 0.2 g (e) Gram molecular mass of oxygen (O₂) = 2 x 16 = 32 g Mass of 6.022 × 10²³ molecules of O₂ = 32 g Mass of 1 molecule of O₂ = = 5.314 × 10^-23 g (f) Atomic weight of calcium = 40 g Gram atom = Therefore, 0.25 = Mass of calcium = 40 x 0.25 = 10 g

Chemistry

Calculate the weight/mass of :
(a) an atom of oxygen
(b) an atom of hydrogen
(c) a molecule of NH₃
(d) 10²² atoms of carbon
(e) 0.25 gram atom of calcium

Mole Concept

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Chemistry

Calculate the weight/mass of :(a) an atom of oxygen(b) an atom of hydrogen(c) a molecule of NH3(d) 1022 atoms of carbon(e) 0.25 gram atom of calcium