Question

a constant volume gas thermometer using sulphur records a pressure of 2× 10^4pa at the triple point of water and 2.87 ×10^4 pascal at the temperature of melting sulphur. calcultr the melting point of sulphur.

Answer 1

The melting point of the sulphur is 391.98 K

Explanation:

Triple  point of water =Ttr = 273.16 K

Pressure at the triple  point at water Ptr = 2 × 10^4 pa

Pressure at the temperature  of  melting sulphur =2.87 × 10^4 pa

We know that

Ptr/p = Ttr / T

Therefore  Temperature of melting sulphur

T = Ptr/p × Ttr

T = (2.87×10^4 /2×10^4) × 273.16 K

T = 1.434 × 273.16 K = 391.98 K

Thus the melting point of the sulphur is 391.98 K

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A copper block of mass 2.5 kg is heated in a furnace to a temperature of 500 °C and then placed on a large ice block. What is the maximum amount of ice that can melt? (Specific heat of copper = 0.39 J g –1 K –1 ; heat of fusion of water = 335 J g –1 ). ?

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Answer 2

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