Calculate the mass (in g) of 2.1×1024 atoms of w. calculate the mass (in ) of atoms of . 1.5 ×102g 3.9×102g 2.4 ×102g 6.4 ×102g 3.2 ×102g

is the symbol of tungsten.

Molar mass of  =

Now, number of atoms are converted to number of moles by Avogadro number i.e.

Number of moles of tungsten  =

number of moles  =

=

Therefore,  1 mole of tungsten consist of   atoms

So,   of tungsten consist of atoms.

Number of moles is also equal to

= or

Thus, mass in g of = .

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

2b2t

explanation:

2b2t