We need draw the structure of (3E,5E)-2,5-dibromo-3,5-octadiene.
The structure is shown below:
The molecule has two double bonds in 3 and 5 position and two Br-atoms attached to 2 and 5 position.
The configuration is 3E and 5E. E configuration indicates cis- isomers where similar groups are in same side with respect to double bonds.
a)
Consumption of power in one day = 
Consumption of power in one year = 
Since,
. So,

Given that
= 
So, for
:
$
= $
Hence, the annual cost is $
.
b)
Consumption of power in one day = 
Consumption of power in one year = 
Since,
. So,

Given that
= 
So, for
:
$
= $
Hence, the annual cost is $
.
Peridodic table is rlly confusing
They are studying the planet's ecosystem.
First, calculate the mass of sodium in g with the help of molar mass and number of moles.
Number of moles =
(1)
Molar mass of sodium =
Substitute the given value of number of moles and molar mass of sodium in formula (1)
(1)
(1)
mass of sodium in g = 
Now, according to conversion factor, 1 g = 1000 mg
So,
of sodium =
=
of sodium
Thus, mass of sodium in mg =