6. 5g oxides of lead heated and it was reduced to 4. 2g of lead metals. Calculate the empirical formulae of the oxides

Answer 1

just to simplify the math assume 6500g oxides...
moles of lead=4200/207=20.2 moles=20
Moles of Ox=2300/16=143.7=140 notice the original data was to TWO significant digits..

ratio of O to Pb=140/20 =7

Pb₁O₇