Converting the Given Mass to Moles

Oct 13, 2025 by pynkocean.com 0 views

Understanding the Problem

To determine the number of $$SO_3$$ ions contained in $$99.6 , \text{mg}$$ of $$Na_2SO_3$$, we need to calculate the molar mass of $$Na_2SO_3$$ and then find the number of moles of $$Na_2SO_3$$ present in the given mass. Finally, we will use the mole ratio between $$Na_2SO_3$$ and $$SO_3$$ to find the number of $$SO_3$$ ions.

Calculating the Molar Mass of $$Na_2SO_3$$

The molar mass of $$Na_2SO_3$$ is given as $$126.05 , \text{g/mol}$$. This value represents the sum of the atomic masses of sodium ($$Na$$), sulfur ($$S$$), and oxygen ($$O$$) in the compound.

Converting the Given Mass to Moles

To find the number of moles of $$Na_2SO_3$$, we need to convert the given mass of $$99.6 , \text{mg}$$ to grams. We can do this by dividing the mass in milligrams by $$1000$$, since there are $$1000$$ milligrams in a gram.

# Convert mass from milligrams to grams
mass_in_grams = 99.6 / 1000
print(f"Mass in grams: {mass_in_grams} g")

Calculating the Number of Moles of $$Na_2SO_3$$

Now that we have the mass in grams, we can calculate the number of moles of $$Na_2SO_3$$ using the formula:

\text{Number of moles} = \frac{\text{Mass in grams}}{\text{Molar mass}}

# Calculate the number of moles of Na2SO3
moles_of_Na2SO3 = mass_in_grams / 126.05
print(f"Number of moles of Na2SO3: {moles_of_Na2SO3} mol")

Finding the Number of $$SO_3$$ Ions

Since the molar mass of $$SO_3$$ is $$80.06 , \text{g/mol}$$, we can use the mole ratio between $$Na_2SO_3$$ and $$SO_3$$ to find the number of $$SO_3$$ ions. The mole ratio is given by the ratio of the molar masses of $$Na_2SO_3$$ and $$SO_3$$.

# Calculate the mole ratio between Na2SO3 and SO3
mole_ratio = 126.05 / 80.06
print(f"Mole ratio between Na2SO3 and SO3: {mole_ratio}")

Calculating the Number of $$SO_3$$ Ions

Now that we have the mole ratio, we can calculate the number of $$SO_3$$ ions by multiplying the number of moles of $$Na_2SO_3$$ by the mole ratio.

# Calculate the number of SO3 ions
num_SO3_ions = moles_of_Na2SO3 * mole_ratio
print(f"Number of SO3 ions: {num_SO3_ions}")

Final Answer

The final answer is: $\boxed{1.52 \times 10^{27}}$

Discussion

This problem requires a thorough understanding of the concept of molar mass and mole ratio. The student needs to be able to calculate the molar mass of $$Na_2SO_3$$ and $$SO_3$$, and then use the mole ratio to find the number of $$SO_3$$ ions. This problem also requires the student to be able to convert between units of mass and moles.

Conclusion

In conclusion, the number of $$SO_3$$ ions contained in $$99.6 , \text{mg}$$ of $$Na_2SO_3$$ is $$1.52 \times 10^{27}$$. This problem requires a thorough understanding of the concept of molar mass and mole ratio, and the student needs to be able to calculate the molar mass of $$Na_2SO_3$$ and $$SO_3$$, and then use the mole ratio to find the number of $$SO_3$$ ions.

Q: What is the molar mass of $$Na_2SO_3$$?

A: The molar mass of $$Na_2SO_3$$ is $$126.05 , \text{g/mol}$$.

Q: How do I convert the given mass of $$99.6 , \text{mg}$$ to grams?

A: To convert the given mass to grams, you can divide the mass in milligrams by $$1000$$, since there are $$1000$$ milligrams in a gram.

Q: What is the formula to calculate the number of moles of $$Na_2SO_3$$?

A: The formula to calculate the number of moles of $$Na_2SO_3$$ is:

\text{Number of moles} = \frac{\text{Mass in grams}}{\text{Molar mass}}

Q: How do I calculate the mole ratio between $$Na_2SO_3$$ and $$SO_3$$?

A: To calculate the mole ratio, you can divide the molar mass of $$Na_2SO_3$$ by the molar mass of $$SO_3$$.

Q: What is the molar mass of $$SO_3$$?

A: The molar mass of $$SO_3$$ is $$80.06 , \text{g/mol}$$.

Q: How do I calculate the number of $$SO_3$$ ions?

A: To calculate the number of $$SO_3$$ ions, you can multiply the number of moles of $$Na_2SO_3$$ by the mole ratio between $$Na_2SO_3$$ and $$SO_3$$.

Q: What is the final answer to the problem?

A: The final answer is: $\boxed{1.52 \times 10^{27}}$

Q: What is the significance of the mole ratio in this problem?

A: The mole ratio is used to find the number of $$SO_3$$ ions by comparing the number of moles of $$Na_2SO_3$$ to the number of moles of $$SO_3$$.

Q: What is the relationship between the molar mass of $$Na_2SO_3$$ and the number of $$SO_3$$ ions?

A: The molar mass of $$Na_2SO_3$$ is related to the number of $$SO_3$$ ions through the mole ratio. The mole ratio is used to find the number of $$SO_3$$ ions by comparing the number of moles of $$Na_2SO_3$$ to the number of moles of $$SO_3$$.

Q: What is the importance of understanding the concept of molar mass and mole ratio in this problem?

A: Understanding the concept of molar mass and mole ratio is crucial in this problem as it allows you to calculate the number of $$SO_3$$ ions by comparing the number of moles of $$Na_2SO_3$$ to the number of moles of $$SO_3$$.

Q: How can I apply this concept to other problems?

A: You can apply this concept to other problems by understanding the relationship between the molar mass of a compound and the number of moles of its constituent elements.

Q: What are some common mistakes to avoid when solving this type of problem?

A: Some common mistakes to avoid when solving this type of problem include:

Not converting the given mass to grams
Not calculating the mole ratio correctly
Not using the correct formula to calculate the number of moles
Not understanding the concept of molar mass and mole ratio

Q: How can I improve my understanding of this concept?

A: You can improve your understanding of this concept by practicing problems that involve calculating the number of moles of a compound and its constituent elements.