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50gm of water and an equal volume of alcohol (sp.gravity = 0.8) are placed one after another in a calorimeter of water equivalent 2gm. They are found to cool from 60°C to 55°C in 2 min. and 1min respectively. The sp.heat of Alcohol in Cal gm^-1 °C^-1 is

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0.6

0.1

0.4

0.3

answer is D.

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Detailed Solution

t

1

​

m

1

​

s

1

​

Δ

T

1

​

​

=

t

2

​

m

2

​

s

2

​

Δ

T

2

​

​

=

t

2

​

Vρs

2

​

Δ

T

2

​

​

=

tQ

​

\frac{(50+2)(60-55)}{60} = \frac{(s \times 50 \times 0.8 + 2)(60-55)}{60}

60

(

50

+

2

)

(

60

-

55

)

​

=

60

(

s

\times

50

\times

0.8

+

2

)

(

60

-

55

)

​

S = \frac{\tfrac{2}{52} \times 60}{84} = 0.6

S

=

84

522

​

\times

60

​

=

0.6

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