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Jorden Ballard
Chemistry
20 March, 10:22
How many grams are in 2.57x10^15 molecules of Co
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Wyatt Mack
20 March, 10:49
0
Mass = 25.37 * 10⁻⁸ g
Explanation:
Given dа ta:
Number of grams of Co = ?
Number of molecules = 2.57*10¹⁵
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms, ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 * 10²³ is called Avogadro number.
For example,
18 g of water = 1 mole = 6.022 * 10²³ molecules of water
For Co:
2.57*10¹⁵ molecules * 1 mole / 6.022 * 10²³ molecules
0.43 * 10⁻⁸ moles
Mass of Co:
Mass = number of moles * molar mass
Mass = 0.43 * 10⁻⁸ mol * 59 g/mol
Mass = 25.37 * 10⁻⁸ g
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