If the molar mass of X is 36g, the number of moles of X dissolved...
If the molar mass of X is 36g, the number of moles of X dissolved at 343K is
- A) 0.2 moles
- B) 0.7 moles
- C) 1.5 moles
- D) 2.0 moles
Correct Answer: B) 0.7 moles
Explanation
In order to explain this question, we need to first understand the concept of moles and molar mass. A mole is a unit used in chemistry to express the amount of a substance. It is the amount of substance that contains the same number of particles (atoms, molecules, ions, or other elementary units) as there are in 12 grams of pure carbon-12. The molar mass of a substance is the mass of one mole of that substance, expressed in grams per mole (g/mol).
Now, let's analyze the given information. We are told that the molar mass of the substance X is 36g. We also know that the substance is dissolved at 343K. The temperature, however, is not relevant to finding the number of moles in this case.
We want to find the number of moles of X dissolved. To do this, we need to know the mass of X that has been dissolved. Unfortunately, the mass of X is not given in the question, so we cannot determine the number of moles directly. However, we can still look at the options and try to understand why the correct answer is 0.7 moles (Option B).
If we assume that 0.7 moles of X are dissolved, we can calculate the mass of X dissolved by multiplying the number of moles by the molar mass:
\(mass = moles