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.
sum A+B-liquidproduct=gas given off.
The answer is in the law of conservation of mass.
Answer B is wrong.
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!
the correct answer is c
Thank you bobpursley, the equation really helped me! I was so confused.
the answer is D guys lol
I redid the test an got the answers
To solve this question, we can use the law of conservation of mass, which states that during a chemical reaction, the total mass of the reactants is equal to the total mass of the products.
Let's analyze the data provided:
Mass (g)
Liquid reactant A: 22.0
Liquid reactant B: 9.0
Liquid product: 17.2
Gas product: ?
To find the mass of the gas product, we need to calculate the total mass of the reactants and compare it to the total mass of the products.
Total mass of the reactants = Mass of liquid reactant A + Mass of liquid reactant B
= 22.0 g + 9.0 g
= 31.0 g
Total mass of the products = Mass of liquid product + Mass of gas product
= 17.2 g + Mass of gas product
According to the law of conservation of mass, the total mass of the reactants must equal the total mass of the products. Therefore, we can set up the equation:
Total mass of the reactants = Total mass of the products
31.0 g = 17.2 g + Mass of gas product
To find the mass of the gas product, we rearrange the equation:
Mass of gas product = Total mass of the reactants - Total mass of the products
Mass of gas product = 31.0 g - 17.2 g
Mass of gas product = 13.8 g
Therefore, the correct answer is C. No, the actual mass of the gas product is 13.8 g.
Note: In this question, the student guessed that the mass of the gas product was no more than 10.0 grams, but the actual mass is 13.8 grams.