After the first 2 min the 20 g are only 10g, (1 half-life)
after other 2 more min 5g (2 half-lives)
after other 2 more min 2.5 g (3 half-lives)
after 2 more 1.25 g (4 haf lifes)
I think it’s C but not certainly positive
Energy required to vaporize : 32.3 kJ
<h3>Further explanation
</h3>
The heat to change the phase can be formulated :
Q = mLf (melting/freezing)
Q = mLv (vaporization/condensation)
Lf=latent heat of fusion
Lv=latent heat of vaporization
Mass of water = 14.27 g
Latent heat of vaporization
( boiling point of 100 ºC) : 2260 J/g
Energy required :

a window
Explanation:
The diagram attached that shows light interacting with an object shows that the object is most definitely a window.
The window must have been made up of glass.
- The wave path completely describes refraction of waves as they cross the boundary between two medium.
- The light moves from a less dense to a denser medium and this causes the velocity to slow down.
- On coming from the other side, the wave rays are attenuated.
learn more:
Refraction brainly.com/question/12370040
Reflection and diffraction brainly.com/question/3183125
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