$($USE and $20\%40\%))$ Turn in scrap paper with calculations. Must show work. Round off to the first decimal point when performing calculations.

The oxygen: air entrainment ratio for $60\%$ oxygen is

$($A$)1$:$0\mathrm{.}7$

$($B$)1$:$1$

$($C$)1$:$3$

$($D$)1$:$5$

$($E$)1$:$7$

Calculate the $O_2$ : air ratio of $30\%$ oxygen

$($A$)1$:$7\mathrm{.}8$

$($B$)1$:$8\mathrm{.}1$

$($C$)1$:$8\mathrm{.}9$

$($D$)1$:$10$

$($E$)1$:$12$

An oxygen flow rate of $12\frac{l}{m}in$ is used on a $60\%$ venturi mask. What is the $O_2$ : air entrainment ratio of the venturi mask? What is the total flow at this oxygen flow rate?

$($A$)1$:$0\mathrm{.}6$;$19\mathrm{.}2\frac{L}{m}in$

$($B$)1$:$1$;$24\frac{L}{m}in$

$($C$)1$:$1$;$26\mathrm{.}4\frac{L}{m}in$

$($D$)1$:$1\mathrm{.}6$;$31\mathrm{.}2\frac{L}{m}in$

$($E$)1$:$1\mathrm{.}6$;$36\frac{L}{m}in$

What is the total flow of a $40\%$ venturi mask running at $6\frac{L}{m}in$ of oxygen?

$($A$)12\frac{L}{m}in$

$($B$)18\frac{L}{m}in$

$($C$)24\frac{L}{m}in$

$($D$)28\frac{L}{m}in$

If a patient is using a $40\%$ venturi mask and a total flow of $36\frac{L}{m}in$ is desired, what should be

$($E$)32\frac{L}{m}in$ the minimum oxygen flow rate?

$($A$)6\frac{L}{m}in$

$($B$)7\frac{L}{m}in$

$($C$)8\frac{L}{m}in$

$($D$)9\frac{L}{m}in$

$($E$)10\frac{L}{m}in$