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Calculate the numbers of molecule present in one litre of water assuming that the density of water is 1g /cm3?

Calculate the numbers of molecule present in one litre of water assuming that the density of water is 1g /cm3? The volume at STP of 2.8g of nifrogen gas is 10) Calculate the number of molecules present a) in 34.20 yams of cane sugar (C12H220n) b) in one litre of water assuming that the density ofw4ier is 1 g/cm3 c) in one drop of water having mass 0.05 g. 23 (0.023 2

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1]c12h22o11-12*6+22+16*11
72+22+176
270-1mole 
34.2-?
34.2/270
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Given, density of water = 1g/cm3
               1 Litre = 1000 cm3
mass = density x volume = 1000 x1 = 1000g 
also molar mass of water = 2*1 + 16  = 2+16 = 18g
no. of moles = given mass/molar mass = 1000/18 = 500/9 mol.
no of molecules in 1 mole= 6.022 * 1023
therefore, no. of molecules in 500/9 moles = 500/9 * 6.022 * 1023
                                                                    =3.3456 * 1025
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