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Chemistry
Luciano Travis
30 July, 16:24
How many atoms of hydrogen are in 2.50g of water
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Case Oconnor
30 July, 16:42
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1.67 * 10²³ atoms of hydrogen present in 2.5 g of water.
Explanation:
Given dа ta:
Mass of water = 2.5 g
Number of hydrogen atoms=?
Solution:
First of all we will calculate the molar mass of water.
Molar mass of H₂O = 16 + 1 * 2 = 18 g/mol
The number of atoms will be determine through the Avogadro number.
The number 6.022*10²³ is called Avogadro number and it is the number of atoms or molecules in one gram of atoms of an element or one gram molecules of a compound.
First of all we will calculate the number of moles of water in 2.5 g.
Number of moles = mass / molar mass
Number of moles = 2.5 g / 18 g/mol
Number of moles = 0.139 mol
The number of molecules of water in 10 g.
0.139 * 6.022*10²³ = 0.837 * 10²³molecules
one water molecule contain two hydrogen atoms. For 0.837*10²³ molecules,
0.837*10²³ * 2 = 1.67 * 10²³ atoms
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