The Henry's Law Constant for Oxygen Dissolving in Blood Is $\degree$

Multiple Choice

The Henry's law constant for oxygen dissolving in blood is 3.74 *10^-2 mol/L . atm at body temperature, 37 $\degree$ C.Calculate the molar concentration of oxygen in blood for an alpine climber where the atmospheric pressure is 0.45 atm.The mole fraction of oxygen in air is 0.209.

A) 7.8 *10^-3 M
B) 3.5 * 10^-3 M
C) 2.3 * 10^-2 M
D) 1.3 * 10^-2 M
E) 0.11 M