Answer:
Option B is the most correct.
If a system loses energy to the surroundings, then the surroundings must do an equal amount of work on the system. if the surroundings gain energy from the system, then the system must lose an equal amount of energy.
Explanation:
The first law of thermodynamics is the law of conservation of energy. It explains that energy can neither be created nor destroyed, but can only be transformed from one form to another of transferred from one place to another (In various forms at times).
So, if a system gains energy from the surroundings, it is evident that this energy wasn't created, it was transferred in from the surroundings, meaning that the surroundings have lost that same amount of energy and vice versa.
So, it is obvious why option B is the most correct of all the options.
Hope this Helps!!!
Number of moles of FeCl2 used = mass/ molar mass
Number of moles = 507/126.751 = 4.
If one mole of Fe reacts with two moles of sodium
Then 4 moles of Fe produces 8 moles of sodium.
Number of moles of sodium = mass/molar mass
Molar mass of sodium chloride = 23 +35.5 = 58.5 g/mol
Hence mass = 8 * 58.5 = 468 g. Hence Option A.
Answer:
Metre
Explanation:
the SI unit of length is <em>Me</em><em>tre</em>