Chemistry-
General
Easy
Question
Concrete is produced from a mixture of cement, water and small stones. Small amount of gypsum, 
is added in cement production to improve the subsequent hardening of concrete. The elevated temperature during the production of cement may lead to the formation of unwanted hemihydrate
according to reaction,
The 
of
are 
and 
respectively. The respective values of their standard entropies are 194.0, 130.0 and 
. The values of 
Answer the following questions on the basis of above information
Heat change occurring during conversion of 1 kg of 
(molar mass 172 g 
) of 
is equal to
The correct answer is:
(for 1 mol)
For 1 kg 
Number of moles 
Heat change for 5.81 mol of
Related Questions to study
chemistry-
For an ideal gas, an illustration of three different paths 
and 
from an initial state 
to a final state 
is shown in the given figure
Path A represents a reversible isothermal expansion from 
to 
. Path 
represents a reversible adiabatic expansion (
) from 
to
followed by reversible heating the gas at constant volume (
) from 
to . Path represents a reversible expansion at constant pressure 
from 
to 
followed by a reversible cooling at constant volume 
from to
What is 
, for path 
?
For an ideal gas, an illustration of three different paths and from an initial state to a final state is shown in the given figure
Path A represents a reversible isothermal expansion from to . Path represents a reversible adiabatic expansion () from to followed by reversible heating the gas at constant volume () from to . Path represents a reversible expansion at constant pressure from to followed by a reversible cooling at constant volume from to
What is , for path ?
chemistry-General
maths-
If t is parameter, A = (aSec t, bTan t) and B = (-aTan t, bSec t), O = (0, 0) then the locus of the centroid of 
OAB is
If t is parameter, A = (aSec t, bTan t) and B = (-aTan t, bSec t), O = (0, 0) then the locus of the centroid of OAB is
maths-General
maths-
A straight line of length 9 units slides with its ends A, B always on x and y axes respectively. Locus of centroid of OAB is
A straight line of length 9 units slides with its ends A, B always on x and y axes respectively. Locus of centroid of OAB is
maths-General
physics-
If the earth were to suddenly contract so that its radius become half of it present radius, without any change in its mass, the duration of the new day will be....
If the earth were to suddenly contract so that its radius become half of it present radius, without any change in its mass, the duration of the new day will be....
physics-General
Maths-
If the angles of the Δ ABC are in A.P then 3R2=1
s denotes the semi-perimeter of the triangle ABC, ∆ its area and R the radius of the circle circumscribing the triangle ABC i.e., R is the circum-radius.
If the angles of the Δ ABC are in A.P then 3R2=1
Maths-General
s denotes the semi-perimeter of the triangle ABC, ∆ its area and R the radius of the circle circumscribing the triangle ABC i.e., R is the circum-radius.
physics-
Two circular loop A & B of radius rA and rB respectively are made from a uniform wire. The ratio of their moment of inertia about axes passing through their center and perpendicular to their planes is 
is equal to...
Two circular loop A & B of radius rA and rB respectively are made from a uniform wire. The ratio of their moment of inertia about axes passing through their center and perpendicular to their planes is is equal to...
physics-General
Maths-
In 
s denotes the semi-perimeter of the triangle ABC, ∆ its area and R the radius of the circle circumscribing the triangle ABC i.e., R is the circum-radius.
In
Maths-General
s denotes the semi-perimeter of the triangle ABC, ∆ its area and R the radius of the circle circumscribing the triangle ABC i.e., R is the circum-radius.
maths-
In 
In
maths-General
physics-
A cylinder of mass 5 kg. and radius 30 cm, and free to rotate about its axis, receives an angular impulse of 3 kgM2 S-1 initially followed by a similar impulse after every 4sec. what is the angular speed of the cylinder 30 sec after initial emulse ? The cylinder is at rest initially
A cylinder of mass 5 kg. and radius 30 cm, and free to rotate about its axis, receives an angular impulse of 3 kgM2 S-1 initially followed by a similar impulse after every 4sec. what is the angular speed of the cylinder 30 sec after initial emulse ? The cylinder is at rest initially
physics-General
maths-
In 
In
maths-General
physics-
A body of mass m is tied to one end of spring and whirled round in a horizontal plane with a constant angular velocity. The elongation in the spring is one centimeter. If the angular velocity is doubted, the elongation in the spring is 5 cm. The original length of spring is..
A body of mass m is tied to one end of spring and whirled round in a horizontal plane with a constant angular velocity. The elongation in the spring is one centimeter. If the angular velocity is doubted, the elongation in the spring is 5 cm. The original length of spring is..
physics-General
Maths-
In 
In
Maths-General
maths-
Let n be the number of points having rational coordinates equidistant from the point 
Let n be the number of points having rational coordinates equidistant from the point
maths-General
biology
Both sickle cell anemia and Hunington’s chorea are :
Both sickle cell anemia and Hunington’s chorea are :
biologyGeneral
biology
HIV that causes AIDS, first starts destroying
HIV that causes AIDS, first starts destroying
biologyGeneral
