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Per NCERT, in the Activity 9.3 reaction between sodium sulfate and barium chloride, does the TOTAL MASS change after mixing?
AMass becomes zero
BYes, mass decreases
CYes, mass increases
DNo — total mass before mixing equals total mass after, since no gas escapes (closed system, no gaseous product)
Answer & Solution
Correct answer: D. No — total mass before mixing equals total mass after, since no gas escapes (closed system, no gaseous product)
Per NCERT Activity 9.3, no gas forms so the closed system conserves mass: reactant mass = product mass.
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