Given the two half-reactions. what must be done in the next step before the reaction can be balanced?
au → au
show the number of electrons being lost or gained
make sure that the charges are balanced
list the atoms that need to be balanced

1. (1.2kw)x(15/60hours) = .3kwh --> a

2. (5kw)x(90/60hours)x(8cents/kwh) = $0.60 --> d

3. microwave --> 1200 watts = (1.2kw)x(6/60hours) = .12kwh

coffee-maker --> 900 watts = (.9kw)x(10/60hours) = .15kwh

therefore, it requires more energy for the coffee-maker to do the same amount of work.

so the answer is a.

i believe the answer is a or 1

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