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1 mole=6.02*10^23 molecules
=>1 molecule=1/(6.023*10^23) moles
=>6.02*10^20 molecules=6.02*10^20/(6.02*10^23) moles
                                        =10^-3 moles
no. of moles=given wt. of substance/molar mass
10^-3=(44*10^-3)/molar mass   (1 mg=10^-3 gm)
=>molar mass of the given substance is 44 gm
7 4 7
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