Answer:
C
Explanation:
Exothermic means that heat is released from the reaction
Answer: 72 grams of
are needed to completely burn 19.7 g 
Explanation:
According to avogadro's law, 1 mole of every substance weighs equal to molecular mass and contains avogadro's number
of particles.
To calculate the number of moles, we use the equation:

Putting in the values we get:


According to stoichiometry:
1 mole of
requires 5 moles of oxygen
0.45 moles of
require=
moles of oxygen
Mass of 
72 grams of
are needed to completely burn 19.7 g 
The SI unit for temperature is Kelvin.
Answer:
oceans is the answer that I got
There are two scales, one is a Ritcher scale and another one is called a Mercalli scale.