Solving Equations 7–5
File name 32sii-Manual-E-0424
Printed Date : 2003/4/24 Size : 17.7 x 25.2 cm
24
273.1
!@)
Calculates T (Kelvins).
f
#O
/)
Stores 297.1 in T; solves for P in
atmospheres.
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
×
28/V, where
28 is the molecular weight of nitrogen).
Keys: Display: Description:
{
G
º#/ºº!
Displays the equation.
{
N
@)
Solves for N; prompts for P.
.05
f
#@)
Stores .05 in P; prompts for V.
5
f
@)
Stores 5 in V; prompts for H.
f
!@)
Retains previous R; prompts for T.
18
273.1
!@)
Calculates T (Kelvins).
f
#
/)
Stores 291.1 in T; solves for N.
28
y
)
Calculates mass in grams, N
×
28.
K
V
p
)
Calculates density in grams per
liter.
Understanding and Controlling SOLVE
SOLVE uses an iterative (repetitive) procedure to solve for the unknown
variable. The procedure starts by evaluating the equation using two initial
guesses for the unknown variable. Based on the results with those two guesses,
SOLVE generates another, better guess. Through successive iterations, SOLVE
finds a value for the unknown that makes the value of the equation equal to
zero.
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