Calculate the number of molecules contained in 0.7kg of oxygen under normal conditions
Answers
Given : weight of oxygen gas is 0.7 kg under normal conditions.
To find : The number of molecules of oxygen gas in 0.7 kg mass of oxygen gas.
Solution : first we should find out number of moles in 0.7 kg of oxygen gas.
no of moles = weight in gram/molecular weight of oxygen gas
= (0.7 × 1000)g/(32g/mol)
= 700/32 = 21.875 moles
no of molecules = no of moles × Avogadro's number
= 21.875 × 6.023 × 10²³
= 131.753125 × 10²³
= 1.31753125 × 10^25 ≈ 1.32 × 10^25
Therefore number of molecules is 1.32 × 10^25.
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