ANSWERS: 1
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The first one has on the left: 2 Fe, 6 NO3, 6 Na, 3 S on the right: 2 Fe 3 S, 6 Na, 6 No3 so it balances. The second one has on the left 1 Fe, 3 No3, 6 Na, 3 S on the right 2 Fe, 3 S, 3 Na, 6 NO3 (NO3 doesn't balance). The third one has on the left 2 Fe, 6 No3, 6 Na, 3 S on the right, 2 Fe, 3 S, 3 Na, 3 No3 (NO3 doesn't balance). The first one also looks right. Let Na have one positive charge, then in this equation, S must have 2 negative, Fe have three positive and NO3 one negative. This works on both sides of the equation. Did you get it right?
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