The total mass is 10.57+6.96=17.53 g.
So, the percent by mass of magnesium is (10.57)/(17.53) * 100 = <u>60.3%</u>
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The percent by mass of oxygen is (6.96)/(17.53) * 100 = <u>39.7%</u>
Potential to kenetic energy
Answer:
<h2>Hereis the correct answer </h2>
(A.-9)
Explanation:
<h3>STUDY CORRECTION. </h3>
Exothermic releases energy(heat) from the system to the surrounding
endothermic takes energy (heat) from the surrounding to the system