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A student follows the lab procedure below:

Lab Procedure:

1. Add 15 g water to a 500 mL beaker

2. Add 3 g salt to the beaker

3. Stir the contents of the beaker for 45 seconds

4. Add 8 g vinegar to the beaker

Using the Law of Conservation of Matter, what will be the mass of the contents in the beaker?
Responses
A 11 g
B 4 g
C 26 g
D 15 g

1 answer

According to the Law of Conservation of Matter, the mass of the substances before and after a chemical reaction or physical change must remain the same, as no mass is lost or gained in the process.

Let's calculate the total mass based on the procedure:

  1. Mass of water = 15 g
  2. Mass of salt = 3 g
  3. Mass of vinegar = 8 g

Now, we sum these masses:

  • Total mass = 15 g (water) + 3 g (salt) + 8 g (vinegar) = 26 g

So, the mass of the contents in the beaker will be 26 g.

The correct response is C 26 g.