The molecular mass of water is 18a. find the mass of 3 GMM H_{2}*O b. how many moles of molecules are therein 126g of H 2 O? c. calculate the number of water moleculesin 180g water.d. find the volume of 90g of water at STP.
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a) 1 Gram Molar mass(GMM) of H2O is 18g
3 GMM of H2O is 3×18 = 54g
b) 18g in 1 mole
126g in = 126/18 = 7 moles
c) 180g = 180/18 = 10 moles
d) At stp 18g of H2O have volume of 22.4
For 90g = 22.4×90/18 = 112L
hope this will help you
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