You can find the moles if the equation of the reactions is given
The sand is the residue and a mixture of salt dissolved in water is the filtrate
<h2>Answer:</h2>
Correct option is B.
B. To relate the type of box material to the warmth of air within the box.
<h2>Explanation:</h2>
Kate gathered three boxes of the same size made of different materials: glass, clear plastic, and aluminum painted black. She placed them on a window sill in the sun for an hour and then measured the warmth of the air in each box. She actually did this to relate the type of box material to the warmth of air within the box.
The given formula for energy is:
(1)
where,
h = planck's constant
c = = (frequency)
n = energy level
Substitute the given value of n and in formula (1)
=
=
=
=
Thus, energy of an electron in the hydrogen atom when n = 5 is
%= total atomic mass of element/formula mass of the compoundX100
atomic mass(Ar) of sulfur- 32
Ar of Cu- 64
Ar of O-16
64+32+(16x4)= 160
32/160=0.2
0.2x100=20
20%