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Standard XII
Biology
Introduction to Biomolecules
15. What is m...
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15. What is mass and difference between mass and weight? If atoms does not exist in free nature so can carbon an exist Iike C+O2=CO2 And C+1/2 O2=CO
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Q.
If the weight ratio of
C
and
O
2
present is 1:2 and both of reactants completely consume and form
C
O
and
C
O
2
and we will obtain a gaseous mixture of
C
O
and
C
O
2
. What would be the weight ratio of
C
O
and
C
O
2
in mixture?
Q.
If the weight ratio of
C
and
O
2
present is 1:2 and both of reactants completely consume and form
C
O
and
C
O
2
. We will obtain a gaseous mixture of
C
O
and
C
O
2
in the ratio:
Q.
Only
N
2
, CO and
C
O
2
gases remain after 0.72 gm of carbon is treated with one litre of air at
27
0
C
and 4.92 atm pressure. Assume air composition
O
2
= 20%,
N
2
= 79% and
C
O
2
= 1% (by volume). The heat evolved (in Kcal) under constant pressure is:
Given :
C
+
O
2
→
C
O
2
,
Δ
H
=
−
100
K
c
a
l
/
m
o
l
C
+
1
2
O
2
→
C
O
,
Δ
H
=
−
25
K
c
a
l
/
m
o
l
Q.
What is the relation between an
N
e
atom (mass number of
20
) and an
O
2
−
ion (mass number of
16
)?
Q.
If atoms are not able to exist independently, what about argon (Ar), helium (He) ; it made of 1 atom only right? So therefore how thats able to exist?
And hydrogen (H2) , is made of 2 atoms right? So why hydrogen is not able to exist independently?
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