Calculate the number of molecules in 45g of water.(molecular mass of oxygen is 32u and that of hydrogen is 2u)
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molecular mass of H2O=36
moles=given mass\gram molecular mass
moles=45/36
number of molecules=moles×6.02×10^23
number of molecules=7.525×10^23
moles=given mass\gram molecular mass
moles=45/36
number of molecules=moles×6.02×10^23
number of molecules=7.525×10^23
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