Bell metal contains 80% copper the mass of bell metal which contains 1

1.	Bell metal contains 80% copper the mass of bell metal which contains 1.5*1020 atoms of copper is
Answer» According to Avogadro's constant, 1 mole of a any substance has exactly 6.022 × 10²³ atoms or molecules. Find the number of moles in the bell metal: If 6.022 × 10²³ atoms = 1 mole Then 1.5 × 10²⁰ = 1 ×1.5 x 10²⁰/6.022 × 10²³ = 0.00025 moles molar mass of Cu is 64 mass = moles × molar mass = 0.00025 mol × 64g/mol = 0.016 g Therefore 1.5×10²⁰ atoms of copper has a mass of 0.016 g This 80% of the piece of metal, weight of the mass is 100% = 100/80 × 0.016 = 0.02 g The piece of metal has a mass of 0.02 g

Bell metal contains 80% copper the mass of bell metal which contains 1.5*1020 atoms of copper is

Answer»

According to Avogadro's constant, 1 mole of a any substance has exactly 6.022 × 10²³ atoms or molecules.

Find the number of moles in the bell metal:

If 6.022 × 10²³ atoms = 1 mole

Then 1.5 × 10²⁰ = 1 ×1.5 x 10²⁰/6.022 × 10²³

= 0.00025

moles molar mass of Cu is 64

mass = moles × molar mass

= 0.00025 mol × 64g/mol

= 0.016 g

Therefore 1.5×10²⁰ atoms of copper has a mass of 0.016 g

This 80% of the piece of metal, weight of the mass is 100%

= 100/80 × 0.016 = 0.02 g

The piece of metal has a mass of 0.02 g

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