Question

calculate the mass of 1 molecule of phosphorus (P4) in milligram.
please friends I need it urgently!

Answer 1

phosphorus has atomic mass of 31u
Now we know that weight of 1 mole of element or compound=(atomic mass or formula mass) grams
therefore formula mass of P4=124u
Now apply unitary method-
124g of P4----- 6.023×10∧23 molecules
how much gram------1 molecule

mass of 1 molecule of P4 atom=124÷(6.023×10^23)
                                                 ≈2.6×10∧-23
hope this helps