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What Mass of KBr Is Present in 25.0 g of 14.2% (m/m) KBr Solution?

To determine the mass of KBr present in a given solution, we need to consider the concentration of the solution and the total mass of the solution. In this case, we have a 14.2% (m/m) KBr solution, which means that 14.2 grams of KBr is present in every 100 grams of the solution. We also know that the total mass of the solution is 25.0 grams.

To calculate the mass of KBr, we can use the following formula:

Mass of KBr = (Concentration of KBr / 100) * Total mass of solution

Substituting the values we have:

Mass of KBr = (14.2 / 100) * 25.0

Mass of KBr = 0.142 * 25.0

Mass of KBr = 3.55 grams

Therefore, the mass of KBr present in 25.0 grams of a 14.2% (m/m) KBr solution is 3.55 grams.

FAQs:

Q: What does the 14.2% (m/m) mean in the KBr solution?

A: The 14.2% (m/m) means that the concentration of KBr in the solution is 14.2 grams of KBr per 100 grams of the solution. This is a mass/mass percentage, which expresses the ratio of the mass of solute (KBr) to the mass of the solution.

Q: How was the mass of KBr calculated in the given solution?

A: The mass of KBr was calculated using the formula: Mass of KBr = (Concentration of KBr / 100) * Total mass of solution. By substituting the given values, we obtained the mass of KBr as 3.55 grams.

Q: Can the mass/mass percentage be converted to other units of concentration?

A: Yes, the mass/mass percentage can be converted to other units of concentration such as molarity (M) or molality (m). However, it requires additional information such as the density of the solution or the molar mass of the solute.

Q: Is the mass of KBr the same as the mass of the solute in the solution?

A: Yes, in this case, the mass of KBr is the mass of the solute in the solution. The mass/mass percentage expresses the ratio of the mass of KBr to the mass of the solution.

Q: Can the mass of KBr be greater than the total mass of the solution?

A: No, the mass of KBr cannot be greater than the total mass of the solution. The mass of the solute cannot exceed the mass of the solution itself. It is always a fraction or percentage of the total mass.

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