Answer: D. A buildup of mostly methane gas, which is pontentially explosive.
Explanation:
Firedamp refers to a gas mixture, largely methane, that appear in underground coal mines. It is explosive at concentrations between 5 and 10% in the air.
Answer:
Electrolysis, I hope this helped!
B water at 99c since it is the hottest
The volume of the solution is given below which can be calculated using the molarity formula as 2.18 litres.
<h3>Define the molarity of a solution.</h3>
Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution.

Given data:
M= 0.420M
mass = 64.0 grams
Molar Mass= 74g/mol
To find:
The volume of solution=?
The calculation for a number of moles:
n= 
n= 
n= 0.91 moles
Molarity= 
V= 
V= 2.1768 litres
Thus, the volume of the solution is 2.18 litres.
Find more information about Molarity here:
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