In an experiment to find the percentage conversion of magnesium to magnesium oxide, 0.15g magnesium ribbon was heated in air for 5 minutes. the mass of product found to be 0.22g.

calculate:
a) the number of moles of magnesium at the start of the experiment
b) the mass of oxygen which reacted with magnesium
c) the number of moles of oxygen which reacted.

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.