Fermi
·
Concept Library
·
Courses
·
Books
·
Problems
·
Simulations
·
Math Wiki
·
High School
Fermi
›
Problems
Chemistry
Chemistry
Problem
Consider the following compounds
(1)
H
3
CF
\text{H}_3\text{CF}
H
3
CF
(2)
H
2
CF
2
\text{H}_2\text{CF}_2
H
2
CF
2
(3)
CH
4
\text{CH}_4
CH
4
(4)
H
3
CCF
3
\text{H}_3\text{CCF}_3
H
3
CCF
3
(5)
CH
3
+
CH
2
\text{CH}_3^+\text{CH}_2
CH
3
+
CH
2
(6)
C
2
H
4
\text{C}_2\text{H}_4
C
2
H
4
and calculate the value of
Y
+
X
Y + X
Y
+
X
(where
X
X
X
is the total number of compounds which have
H
−
C
−
H
\text{H}-\text{C}-\text{H}
H
−
C
−
H
bond angles equal to
109
∘
28
′
109^\circ 28'
10
9
∘
2
8
′
and
Y
Y
Y
is the total number of compounds which have
H
−
C
−
H
\text{H}-\text{C}-\text{H}
H
−
C
−
H
bond angles greater than
109
∘
28
′
109^\circ 28'
10
9
∘
2
8
′
and less than
120
∘
120^\circ
12
0
∘
).
Browse the problem library