52
When ethanol C
2
H
5
OH is completely combusted, carbon dioxide CO
2
and
water H
2
O are created.
The chemical reaction formula of this reaction is expressed as follows:
x
C
2
H
5
OH + 3O
2
y
CO
2
+
z
H
2
O
Find the values of
x
,
y
, and
z
to complete the chemical reaction formula.
The numbers of C, H, and O before and after the reaction are equal, hence
Number of C: 2
x
=
y
Number of H: 5
x
+
x
= 2
z
Number of O:
x
+ 6 =
2y
+
z
As such, the following simultaneous equations are obtained:
2
x
-
y
+ = 0
6
x
- 2
z
= 0
x
- 2
y
-
z
= - 6
Solving these gives
x
= 1,
y
= 2,
z
= 3
and the chemical reaction formula is
C
2
H
5
OH + 3O
2
2CO
2
+ 3H
2
O
<Equation mode>
<Simultaneous linear equations
in three unknowns>
Enter the coefficients
Set the mode to Equation
a1 = 2 , b1 = -1 , c1 = 0 , d1 = 0
a2 = 6 , b2 = 0 , c2 = -2 , d2 = 0
a3 = 1 , b3 = -2 , c3 = -1 , d3 = -6
(3-VLE)
Operation
2
1
0
0
6
0
2
0
1
2
1
6
<Example 2>
Simultaneous Calculation
Display
(This example is for EL-W516T only.)
(EQUATION)
Summary of Contents for EL-W516T
Page 1: ...SCIENTIFIC CALCULATOR OPERATION GUIDE SCIENTIFIC CALCULATOR OPERATION GUIDE EL W535TG W516T ...
Page 32: ...32 Example Operation Absolute Value Returns an absolute value Display 3 4 ...
Page 35: ...35 20 30 20 17 2 30 17 2 Trigonometric Functions ...
Page 37: ...37 4 8 12 16 Trigonometric Functions ...
Page 48: ...48 3 10 20 3000 x Integration calculation dx x x 100 0 dx ...
