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Standard XII
Biology
Introduction to Biomolecules
15. What is m...
Question
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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