Calculate the number of moles of sodium oxide that should be produced when 26.50 grams of sodium metal reacts with oxygen gas, O2.

Write the balanced chemical equation.
Use coefficients from balanced equation to determine mole ratio.

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

some sources quote the lethal dose, for an average 170lbs opiate-naive individual is between 75 and 375 mg

it takes on an electronical energy

c. is the answer

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