<u>( I) Bonds are broken, and the reaction is endothermic.</u>
(2) Bonds are broken , and the reaction is exothermic.
(3) Bonds are formed, and the reaction is endothermic.
<span>(4) Bonds are formed, and the reaction is exothermic.</span>
The oceanic plate boundary :)
Best Answer: 4.52 X 10²³ atoms. Use Avogadro's number to multiply 0.750 moles times 6.022 X 10²³
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