First you need the balanced chemical equation:
2 NaHCO3 --> HOH + CO2 + Na2CO3
So if you heat two moles of baking soda, you produce one mole of water, one mole of carbon dioxide and 1 mole of washing soda.
In your example you have 360 kg HOH = 20 kmol; 880 kg CO2 = 20 kmol
You start with 3360 kg of NaHCO3 = 40 kmol
So you will produce 20 kmol of washing soda.
20 kmol * 106 kg/kmol = 2120 kg of washing soda.
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