Overall energy change can be calculated by

1.	Overall energy change can be calculated by
A.	subtracting the energy taken in when bonds are broken from the energy given out, when bonds are made
B.	adding the energy taken in when bonds are broken and the energy given out, when bonds are made
C.	subtracting the energy given out when bonds are made from the energy taken in, when bonds are broken
D.	multiplying all the enthalpy changes
Answer» B. adding the energy taken in when bonds are broken and the energy given out, when bonds are made

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Overall energy change can be calculated by

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