Chemistry, percentage yield from baking powder?

Phosphate baking powder is a mixture of starch, sodium, hydrogen carbonate, and calcium dihydrogen mixed with water, phosphate baking powder releases carbon dioxide gas, causing a dough or batter to bubble and rise.

2NaHCO3 + Ca(H2PO4)2 -> 2Na + Ca + 2HPO4 + 2CO2 + 2H2O

If L of CO2 is needed for a cake and each kilogram of baking powder contains 168 g of NaHCO3, what mass of baking powder must be used to generate this amount of CO2? The density of CO2 at baking temperature is about g/L.

Can someone please guide me through this step-by-step please? I'd appreciate it.

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