calculate no. of Na atoms in
1- 0.46 g of Na
2- 0.8 moles of Na
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Given :
- 0.46 g of Sodium
- 0.8 moles of sodium
To find :
Number of sodium atoms in each
Formula used :
- Number of mole = Mass ÷ molar mass
- Number of atoms = Number of moles × Avogadro's number
Solution :
1. First of all we need to find number of moles of sodium.
➝ Number of moles of sodium = Given mass of sodium ÷ Molar mass of sodium
➩ Number of moles of sodium = 0.46 g ÷ 40 g
➩ Number of moles of sodium = 0.0115 moles
➝ Number of atoms of sodium = Number of moles of sodium × Avogadro's number
➩ Number of atoms of sodium = 0.0115 × 6.02 × 10²³
➩ Number of atoms of sodium = 0.06923 × 10²³
➩ Number of atoms of sodium = 6.923 × 10²¹ atoms
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2.
➝ Number of atoms of sodium = Number of moles of sodium × Avogadro's number
➩ Number of atoms of sodium = 0.8 × 6.02 × 10²³
➩ Number of atoms of sodium = 4.816 × 10²³ atoms
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ANSWER :
- 6.923 × 10²¹ atoms
- 4.816 × 10²³ atoms
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