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Four students A, B, C and D veriied the law of conservation of mass by performing chemical reaction between barium chloride and sodium sulphate. All of them took 107.2 g barium chloride solution and 116.1g of sodium sulphate solution and mixed them in the beaker of mass 150 g. They reported their results as follows:

Students Colour of reaction mixture after mixing Mass of reaction mixture in the beaker including mass of beaker
A White precipitate 383.3g
B Brown precipitate 393.3g
C White precipitate 373.3g
D Brown precipitate 363.3g

The correct observation is that of student.

A. A 

B. B 

C. C 

D. D

1 Answer

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Best answer

Mass of barium sulphate =107.2 g 

Mass of barium chloride = 116.1g 

Mass of beaker = 150 g 

Total mass of reaction mixture in the beaker including mass of Beaker = 107.2g + 116.1g + 150g = 373.3g

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