MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Specific Heat Capacity

A liquid of d...

Question

A liquid of density $0.85 g / c m^{3}$ flows through a calorimeter at the rate of $8.0 c m^{3} / s$ . heat is added by means of a $250 W$ electric heating coil and a temperature difference of $15^{0} C$ is established in steady-state conditions between the inflow and the outflow points of the liquid. The specific heat for the liquid will be:

A

0.6 k c a l / k g K

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

B

0.3 k c a l / k g K

No worries! We‘ve got your back. Try BYJU‘S free classes today!

C

0.5 k c a l / k g K

No worries! We‘ve got your back. Try BYJU‘S free classes today!

D

0.4 k c a l / k g K

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is A $0.6 k c a l / k g K$
This is a problem on flow calorimeter used to measure specific heat of a liquid.
Amount of heat supplied to the water per second by the heating coil=QS=250J
$\frac{250}{4186} k c a l$

The volume of liquid flowing out per second =8.0cm3=8×106m3
Mass of this liquid $= (0.85) \times 1000 \times 8 \times 10^{6} k g$
Temperature rise of this mass of liquid=15∘C
hence
$\frac{250}{4186} = m s t = 0.85 \times 8 \times 10^{3} \times s \times 15$
hence'

$s = 0.6 k c a l / k g K$

Suggest Corrections

thumbs-up

0

Similar questions

Q. A flow calorimeter is used to measure the specific heat of a liquid. Heat is added to a known rate to a stream of the liquid as it passes through the calorimeter at a known rate. Then a measurement of the resulting temperature difference between the inflow and the outflow points of the liquid stream enables us to compute the specific heat of the liquid. A liquid of density

0.2 g / c m^{3}

flows through a calorimeter at the rate of

10 c m^{3} / s

. Heat is added by means of a

250

Watt electric heating coil, and a temperature difference of

25^{\circ} C

is established in steady-state conditions between the inflow and the outflow points. Find the specific heat of the liquid.

Q. A freon 12 simple saturation cycle operates at temperatures of

35^{o} C

15^{o} C

for the condenser and evaporator respectively. If a liquid vapour heat exchanger is installed in the system, with the temperature of the vapour leaving the heat exchanger at

15^{o} C

, the enthalpy of subcooled liquid at exit will be given as

	Superheated by
	20k	40k
(kPa)	h(c)	H(KJ/Kg)	S(KJ/KgK)	S(Kj/KgK)	H(KJ/kgK)	S(KJ/KgK)	H(KJ/Kg)	S(kJ/kgK)
$P_{2}$	55	09.5	201.5	0.6839	216.4	0.731	231.0	0.7741
$P_{1}$	-15		181.0	0.7052	195.2	0.751	205.7	0.7942

Q. It is required to melt 5 tonnes/ hour of iron from iron metal charge at

15^{o} C

to molten metal at

1650^{o} C

. The melting point is

1535^{o} C

. and latent heat is 270 kJ/ kg. Specific heat in solid state is 0.502 kJ/ kgK and in liquid state is 0.534 kJ/ kgK. If electric furnace has 70% efficiency, what is the required kW rating of furnace?

Q. The specific heat of air at constant pressure is

1.005 k J / k g K

and the specific heat of air at constant volume is

0.718 k J / k g K

.Find the specific gas constant.

Q. A gas is heated in a duct as it flows over a resistance heater. Consider a 101 kw electric heating system. The gas enters the heating section of the duct at 100 kPa and

27^{0} C

with a volume flow rate of

15 m^{3} / s

. If heat is lost from the gas in the duct to the surroundings at a rate of 51 kW, the exit temperature of the gas is (Assume constant pressure, ideal gas, negligible change in kinetic and potential energies and constant specific heat;

C_{p} = 1 k J / k g K; R = 0.5 k J / k g K)

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Specific Heat Capacity

PHYSICS

Watch in App

explore_more_icon

Explore more

Specific Heat Capacity

Standard IX Physics

Join BYJU'S Learning Program

CrossIcon