SC-1241
Conservation of mass
Lower Sec Science · Secondary 2 · Medium · Conservation of mass
A student adds 25 g of calcium carbonate to 75 g of hydrochloric acid in an open beaker. After the reaction, 90 g of liquid and solid remain in the beaker. What mass of carbon dioxide gas has escaped into the air?
- 10 g
- 15 g
- 25 g
- 75 g
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