Question

the mass of 1 molecule of a substance is 5.32 into 10 to the power minus 23 what is its molecular mass

Answer 1

molecular mass of sub. =  mass of 1 mole of its molecules.

so here, mass of 1 molecule is  5.32 *10∧-23

and so, mass of 1 mole of molecule is  6.022* 10∧23 (Avogadro constant)

∴ moleculer mass of sub is equal to the mass of it 6.022* 10∧23 molecules 

 so,mass of 1 molecules of subtance                     = 5.32* 10∧-23

     mass for 6.022 *10∧23 molecules of subtance = ?

                                                                         =5.32* 10∧-23 ×6.022* 10∧23 

                                                                         = 32 g

and the 32g moleculer mass is for O2

so, the sub is O2

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