CH4 : Mr. 12+(1x4) =16
C= 12
12/16 x 100 =75%
Answer:
IV
Explanation:
Entropy is a measure of the degree of disorderliness in a particular molecule. What we are saying is that randomization plays an important role in the quest for determining a molecule at a point of disorderliness.
Now let us look at the answer choices.
N2 is a gas and is expected to have a high amount of degree of disorderliness.
SiO2 although is at the absolute zero temperature which is supposed to necessitate a low entropy amount, the fact that it is not ordered I.e amorphous confers a degree of disorderliness in its molecule.
NaCl although perfectly ordered is not at the absolute zero and hence cannot exhibit the needed degree of disorderliness.
Na is our answer choice because it meets the two criteria needed for zero entropy. Firstly, it is of considerable orderliness and hence, entropy isn’t expected in its molecule. Also, it has no disturbance in the case of temperature as it is at absolute zero.
Answer:
4.60 J/°C g
Explanation:
This a simple calorimetry excersise. If all the heat, which is lost by the metal, is gained by the water, we assume that
Q from water = Q from metal
Q = m . C . ΔT
where C is heat capacity and ΔT, the differences between the temperatures. Let's determine the heat gained by water.
Q = 151.6 g . 4.18 J /°C g . (18.9°C - 15.6°C)
Q (+) = 2091 Joules
As this heat, was gained by the water, this heat was lost by the metal (-)
- 2091 Joules = 151.6 g . C . (Final T° - 75.3°C)
We do not know at what T° was the meta, by the end, but all the heat was gained from the water, as water was increased by 3°C, metal decreases -3°C
- 2091 Joules = 151.6 g . C . - 3°C
-2091 J / -3°C . 151.6g = 4.60 J/°C g
Respiratory system and circulatory system both are responsible to control the breathing in Human body.
Answer:- Volume decreases by a factor of 1.15.
Solution:- At constant pressure, volume of the gas is directly proportional to the the kelvin temperature.
The equation is written as:
where, 
is the volume at initial temperature 
and 
is the volume at final temperature 
.
Temperature must be in kelvins. So, let's convert both the temperatures to kelvin.
To convert degree C to kelvin we add 273.
So, = 100 + 273 = 373 K
= 50 + 273 = 323 K
The equation could also be written as:-
= 1.15
From here we could say that the volume decreases by a factor of 1.15.
For example if the initial volume is 1 L then final volume will be 
that is 0.87 L.
