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pastormac2011
15.04.2021 •
Chemistry
What quantity of copper is deposited by the same quantity of electricity that deposited 9g of aluminum
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Ответ:
Mass of copper deposited = 31.75 g
Explanation:
According to Faraday's second law of electrolysis, when the same quantity of electricity is passed through different electrolytes, the relative number of moles of the elements deposited are inversely proportional to the charges on the ions of the elements.
From this law, it can be seen that the higher the charge, the lower the number of moles of a given element deposited.
Number of moles of aluminium in 9 g of aluminium = mass / molar mass
Molar mass of aluminium = 27 g
Number of moles of aluminium = 9/27 = 1/3 moles
Charge on aluminium ion = +3
3 moles of electrons will discharge 1 mole of aluminium,
1 mole of electrons will discharge 1/3 moles of aluminium
Number of moles of electrons involved = 1 mole of electrons
Charge on copper ion = +2
1 mole of electrons will discharge 1/2 moles of copper.
Mass of 1/2 moles of copper = number of moles × molar mass of copper
Molar mass of copper = 63.5 g
Mass of copper deposited = 1/2 × 63.5 = 31.75 g
Ответ:
The given statement is true.
Explanation:
When particles of a substance or object attain internal energy due to the kinetic energy of its particles then this energy is known as thermal energy.
So, when two objects of different temperature are kept in contact with each other then this thermal energy flows from hotter object to cooler object.
This is known as heat is flowing from hot object to cool object.
Hence, we can conclude that the statement heat is the movement of thermal energy from one place to another, is true.