HP 35s User Manual page 127

A 2–liter bottle contains 0.005 moles of carbon dioxide gas at 24°C. Assuming
that the gas behaves as an ideal gas, calculate its pressure. Since Equation mode is
turned on and the desired equation is already in the display, you can start solving
for P:
Keys:
P






A 5–liter flask contains nitrogen gas. The pressure is 0.05 atmospheres when the
temperature is 18°C. Calculate the density of the gas (N
molecular weight of nitrogen).
Keys:







Display:

value

value

value

value





Display:











Description:
Solves for P; prompts for V.
Stores 2 in V; prompts for
N.
Stores .005 in N; prompts
for R.
Stores .0821 in R; prompts
for T.
Calculates T (Kelvins).
Stores 297.1 in T; solves for
P in atmospheres.
28/V, where 28 is the
Description:
Displays the equation.
Solves for N; prompts for P.
Stores .05 in P; prompts for
V.
Stores 5 in V; prompts for
R.
Retains previous R; prompts
for T.
Calculates T (Kelvins).
Solving Equations
7-5