Question

How many CU atoms are present in 0.5mol of copper?
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Answer 1

Explanation:

Hint: To find the number of atoms in any case remember that-The molar mass (g) of any molecule contains ${{N}_{A}}$number of atoms of that molecule. Also, each mole contains ${{N}_{A}}$number of atoms. So, the number of atoms in gm or in moles can be calculated easily.Complete step by step solution: We know, the molar mass of Cu is 63.5g I.e. 63.5g of copper contains Avogadro’s number (${{N}_{A}}$) atoms of copper$\therefore $63.5g copper= $6.023\times {{10}^{23}}$atoms of copper.So, following unitary method, we get-0.635g of copper=$(6.023\times {{10}^{23}}\times 0.635)\div 63.5$atoms of copper= $6.023\times {{10}^{21}}$atoms of copperSimilarly, for 1g of copper we have,1g of copper= $(6.023\times {{10}^{23}}\times 1)\div 63.5$=$9.485\times {{10}^{21}}$atoms of copperFor 0.5g atom of Cu,Number of atoms= $0.5\times 6.022\times {{10}^{23}}$= $3.011\times {{10}^{23}}$atoms of copperNow, for 0.25 moles of copper,$\because $1 mole of copper= $6.023\times {{10}^{23}}$atoms of copper$\theref…

Answer 2

Answer:

6.02 x 1023 atoms

Explanation:

6.02 x 1023 atoms

The relation between molecular (formula) mass and molar mass Page 4 4 • To obtain one mole of copper atoms (6.02 x 1023 atoms), weigh out 63.55 g copper. The molar mass (M) of a substance is the mass of one mole of entities (atoms, molecules, or formula units) of the substance.

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