7.52 X 10 25molecules of NH3

Explanation:

Find moles first

moles = number of particles/ 6×10^23

= 7.52 ×10^25 / 6×10^23

=125.33

calculate molar mass

(1×14) +(3×1) =17

convert to mass

mass= moles × molar mass

=125.33 × 17

=2130.67g

This is a pretty big value usually it's smaller but I'd assume it's because the number of particles was large.

answer: the figure is attached herewith.

step-by-step explanation:   we are given to sketch a unit circle and label the terminal points corresponding to

in the attached figure, we have drawn a unit circle, with centre at o(0,0) and radius 1 unit. we have labelled the points a, b, c, d and e corresponding to the angles below

∠aox = 60°,

∠box = 120°,

∠cox = 180°,

∠dox = 240°,

∠eox = 300°.

and the coordinates are a(0.5,1), b(-0.5,1), c(-1,0), d(-0.5,-1) and e(0.5,-1).

thus, the answer is complete.

c.

explanation: