Science, asked by poonamchhonkar007, 2 months ago

calculate no. of Na atoms in
1- 0.46 g of Na
2- 0.8 moles of Na​

Answers

Answered by MagicalBeast
1

Given :

  1. 0.46 g of Sodium
  2. 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 :

  1. 6.923 × 10²¹ atoms
  2. 4.816 × 10²³ atoms
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