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Measurement, accuracy and precision
Lower Sec Science · Secondary 1 · Hard · Measurement, accuracy and precision
A student mixes 80 cm³ of dilute hydrochloric acid with 4 g of calcium carbonate in a beaker. The total mass of the beaker and contents before the reaction is 200.0 g. After 8 minutes, the mass is 193.5 g. What is the mass of gas that has escaped?
- 1.5 g
- 4.5 g
- 6.5 g
- 393.5 g
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