15. What is the density of carbon tetrachloride if a flask weighing 345.8 g is filled with 225 mL of the liquid, and the total weight of the flask and liquid is 703.55 g?
Answer: A
The density of carbon tetrachloride is 1.59 g/mL.
To find the density of carbon tetrachloride, we first need to determine the mass of the liquid alone. The mass of the liquid can be calculated by subtracting the weight of the empty flask from the total weight of the flask and the liquid, resulting in a mass of 357.75 g. Dividing this mass by the volume of the liquid (225 mL) gives a density of 1.59 g/mL.
A) 1.59 g/mL
Option A is correct. After calculating the mass of the carbon tetrachloride by subtracting the flask's weight from the total weight, we find that the mass is 357.75 g. Dividing this mass by the volume of the liquid (225 mL) confirms that the density is indeed 1.59 g/mL.
B) 2.76 g/mL
Option B is incorrect. This value does not correspond to the calculated density based on the mass and volume of carbon tetrachloride. Even if the mass were significantly higher or the volume lower, this density would not be achievable with the given measurements.
C) 1.4 g/mL
Option C is also incorrect. This density is lower than what is calculated from the provided mass and volume. The correct density must align with the computation of 1.59 g/mL, making this option invalid.
D) None of the above
Option D is incorrect. Since the calculated density of carbon tetrachloride is 1.59 g/mL, it directly contradicts the assertion that none of the listed options are correct. Thus, this option fails as well.
Conclusion
The calculated density of carbon tetrachloride is definitively 1.59 g/mL, as derived from the mass of the liquid and the volume it occupies. All other options present incorrect values that do not align with the calculations based on the provided data, thereby reinforcing the correctness of Option A.