The number oxygen atom in 72 g of water
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molar mass of oxygen is 16g meaning 16g of oxygen contains 6.022*10^23 atoms of oxygen
molar mass of H2O is 18g soin 72g there are 4moles of H2O so there are 5moles of oxygen in it also 1 mole of O is 16g 4moles of O is 16*4=64
no. of atoms = 64*6.022*10^23
=385.408*10^23 atoms
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Answer:
the actual answer is...4 moles
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