Answer:

Explanation:
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In this case, according to the given combustion reaction of octane, it is possible for us to perform the stoichiometric method in order to calculate the mass of octane that is required to consume 300.0 g of oxygen by considering the 2:25 mole ratio, and the molar masses of 114.22 g/mol and 32.00 g/mol respectively:

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The first one because some people might not believe that and others might believe that.
Answer:
No.
Explanation:
No organism can detect X-rays or radio waves
Answer:
Iron and aluminum are examples of metals, along with copper, iron, (etc.)
Answer:
42.38875878%
Explanation:
i divided 4.27 g from 1.81g using a percentage calculator but im not sure if its correct