Calculate the following quantities in 5.6 g of nitrogen (Atomic mass o

1.	Calculate the following quantities in 5.6 g of nitrogen (Atomic mass of N = 14u) : (a) Number of moles of N2. (b) Number of molecules of N2. (c) Number of atoms of nitrogen
Answer» Mass of nitrogen = 5.6 g Atomic mass of N = 14 u Molar atomic mass of N = 14 g/mol , Molar mass of N₂ = 2 x 14 g/ mol = 28 g mol^-1 (a) No. of moles of N₂ in 5.6 g of nitrogen = 5.6 g/28 g mol^-1 = 0.2 mol (b) No. of molecules of N₂ is 5.6 g of nitrogen = 6.023 x 10²³ x No. of moles of N₂ = 6.023 x 10²³ x 0.2 = 1.2 x 10²³ (c) As one molecule of N₂contains two N atoms. No. of atoms of nitrogen = 2 x No. of N₂ molecules = 2 x 1.2 x 10²³ = 2.4 x 10²³

Calculate the following quantities in 5.6 g of nitrogen (Atomic mass of N = 14u) : (a) Number of moles of N2. (b) Number of molecules of N2. (c) Number of atoms of nitrogen

Answer»

Mass of nitrogen = 5.6 g
Atomic mass of N = 14 u
Molar atomic mass of N = 14 g/mol ,
Molar mass of N₂ = 2 x 14 g/ mol = 28 g mol^-1

(a) No. of moles of N₂ in 5.6 g of nitrogen
= 5.6 g/28 g mol^-1
= 0.2 mol

(b) No. of molecules of N₂ is 5.6 g of nitrogen
= 6.023 x 10²³ x No. of moles of N₂
= 6.023 x 10²³ x 0.2
= 1.2 x 10²³

(c) As one molecule of N₂contains two N atoms.
No. of atoms of nitrogen
= 2 x No. of N₂ molecules
= 2 x 1.2 x 10²³ = 2.4 x 10²³

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Calculate the following quantities in 5.6 g of nitrogen (Atomic mass of N = 14u) : (a) Number of moles of N2. (b) Number of molecules of N2. (c) Number of atoms of nitrogen

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