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How many chlorine molecules are in a 37.0 g sample of chlorine gas?
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Answer
Given mass: 37.0 g Cl2 gas
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Molar mass of Cl2: (2×35.45g/mol)=70.9 g/mol
Determine the moles Cl 2 in the given amount as follows:
Number of moles = amount in g/ molar mass
= 37.0 g Cl2×1 / 70.9g Cl2
=0.522 mol Cl2
Determine molecules of Cl2.
According to Avogadro’s hypothesis, 1 mol of any gas contains particles
One mole of any element contains 6.023*10^23 molecules.
0.522 mol Cl2 ×6.022×10^ 23molecules / 1mol Cl2
=3.14×10^23.molecules Cl2
