Science

A student mixed two clear liquids together in a beaker. A gas and a new liquid formed. The
gas escaped, so the student was unable to measure its mass. She guessed that its mass
was no more than 10.0 [LW1] grams. Her data is shown in the table below.

Mass (g)
liquid reactant A 22.0
liquid reactant B 9.0
liquid product 17.2
gas product ?

Is the student's guess about the mass of the gas correct?
A. Yes, the actual mass is 4.8 g.
B. Yes, the actual mass is 9.0 g.
C. No, the actual mass is 13.8 g.
D. No, the actual mass is 17.2 g.

My answer is B, but I have no clue how to solve these sort of things, if it's possible, please explain this to me.

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  1. sum A+B-liquidproduct=gas given off.

    The answer is in the law of conservation of mass.
    Answer B is wrong.

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    bobpursley
  2. Oooh, I see, so I just do math? When I did A+B-LiquidProduct, I got 13.8. Thank you very much for helping me!

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  3. the correct answer is c

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  4. hi how r u is right maybe but if theyre not,,, ok then

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  5. Thank you bobpursley, the equation really helped me! I was so confused.

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