Two types of stoichiometry are; molar mass and coefficients from balanced equation.
An exothermic reaction is a reaction that releases energy.
11. I would say physical because the color of the item is changed and the texture and density is changed aswell.
The best and most correct answer among the choices provided by your question is the fourth choice.
Copper <span>has an average atomic mass of about 63.5 </span>amu<span>.</span>
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Answer
thus, 4 moles of oxygen gas (O2) would have a mass of 128 g.
