Difficulty: Medium

Average Score: 73%

A beaker filled with water has a total mass of 550 g. Then 4 g of salt is added and dissolves completely in the water.

What is the total mass of the beaker and solution after the salt is dissolved?

Rationale

Exactly 554 g

The total mass of the beaker and solution after the salt is dissolved is 554 g, which is the sum of the original mass of the water and the mass of the dissolved salt. Since mass is conserved in this process, the total will equal the initial mass of the water plus the mass of the salt.

A (More than 554 g) YOUR ANSWER

This option suggests that the total mass exceeds 554 g, which is incorrect since the addition of salt does not create additional mass but merely transfers the mass of the salt into the solution. The mass remains constant at 554 g.

B (Exactly 554 g) CORRECT

This is the correct answer because the initial mass of the water was 550 g, and adding 4 g of salt results in a total mass of 554 g. The law of conservation of mass states that mass cannot be created or destroyed in an isolated system, so the total mass remains 554 g.

C (Less than 550 g) YOUR ANSWER

This choice implies that the total mass would be lower than the initial mass of the water, which contradicts the principle of conservation of mass. The mass cannot decrease simply by dissolving salt in water.

D (Between 550 g and 554 g) YOUR ANSWER

This option suggests a total mass that is less than 554 g but more than 550 g, which is incorrect. The total mass after dissolving the salt is precisely 554 g, not a range.

Conclusion

The total mass of the beaker and solution after dissolving the salt is exactly 554 g, reflecting the conservation of mass principle. The initial mass of 550 g combined with the 4 g of salt results in a total that neither increases nor decreases during the dissolution process. Understanding this principle is vital in chemistry, as it underscores the relationship between mass and matter in various chemical reactions.

What is the total mass of the beaker and solution after the salt is dissolved?

Exactly 554 g

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