Before hydrazine came in to use to remove dissolved oxygen, Chemistry

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Before hydrazine came in to use to remove dissolved oxygen

Before hydrazine came in to use to remove dissolved oxygen in the water steam boilers, Na2SO3 was usually used for this purpose:
2Na2SO3(aq) + O2(aq) -> 2Na2SO4(aq) define what mass of Na2SO3 is needed to remove O2 from 3x104L of water?
O2 dissolves in water to the extent of 0.0044g in 100mL of water at 20C

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Chemistry: Before hydrazine came in to use to remove dissolved oxygen

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