How many atoms are in 131.97 liters of water vapor at STP?
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At STP, 22.4 mol of a Substance = 1 mol.
Hence, no of moles of water in 131.97 lit = 131.97/22.4 = 5.891
One mole of water has 6.022*10^23 molecules
Hence, No of molecules = 5.891*6.022*10^23 = 3.547 * 10^24.
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