Concentration Terms Henrys Law

Which of the following contains 0.5 moles of a solute in one molal solution?

1.	1000 g of solvent	2.	500 mL of solvent
3.	500 g of solvent	4.	100 mL of solvent

Given below are two statements: one is labeled as Assertion (A) and the other is labeled as Reason (R):

Assertion (A):	Helium is used to dilute oxygen in the diving apparatus.
Reason (R):	Helium has a high solubility in O2.

In light of the above statements, choose the correct answer from the options given below:

1.	(A) is False but (R) is True.
2.	Both (A) and (R) are True and (R) is the correct explanation of (A).
3.	Both (A) and (R) are True and (R) is not the correct explanation of (A).
4.	(A) is True but (R) is False.

The Henry's law constant K_H values of three gases (A, B, C) in water are 145, 2 \times 10^–5, and 35 kbar, respectively. Determine the order of solubility of these gases in water from highest to lowest:

1.	B > C > A	2.	A > C > B
3.	A > B > C	4.	B > A > C