Answer:
B. They all have molecules in motion.
Explanation:
All substances have molecules in motion, this is because all substances have an average kinetic energy (temperature) of over 0 K.
Answer:
1.772 mols
Explanation:
Because hydrogen exists as a diatomic molecule in gaseous state, that's (H2), so then it's molecular mass is 1 ×2= 2g/mol.
we can now calculate for the number of moles, so
n=m/Mr
n=3.544/2
n=1.772mols
Answer:
Discovery and Naming: The first evidence of helium was obtained on August 18th, 1868 by French astronomer Jules Janssen. While in Guntur, India, Janssen observed a solar eclipse through a prism, whereupon he noticed a bright yellow spectral line (at 587.49 nanometers) emanating from the chromosphere of the Sun.
Answer
<em>Laws </em><em>that </em><em>are </em><em>used </em><em>by </em><em>astronomers </em><em>to </em><em>learn </em><em>about </em><em>stars </em><em>indirectly </em><em>are </em><em>as </em><em>given </em><em>below:</em><em>-</em>
- <em>Kirchhoff's First La</em><em>w</em>
- <em>Cassini's laws</em>
