What is the balanced oxidation half-reaction from the redox reaction below?

fe + cuso4 --> cu + fe(so4)3

2 fe yields 2 fe2+ + 4e-
2 fe2+ + 6e- yields fe
fe yields 2fe3+ + 6e-
2 fe yields 2fe3+ + 6e-

i need i think its either a or d

Apiece of metal with a length of 1.42 cm was measured using four different instruments. which of the following measurements is the most accurate?

Mercury turns to vapor at 629.88 k how much heat is lost 175 g of mercury vapor at 650 current condenses to a liquid at 297 ca mercury turns to weber at 629.88 kelvin how much he is lost 175 g of mercury vapor and 650 coming condensers to liquidate 297 kevin

Atoms contain subatomic particles called protons and neutrons. when these protons and neutrons spilt, a lot of energy is released