JEE Main 2020 (Online) 2nd September Morning Slot | Thermodynamics Question 67 | Chemistry

JEE Main 2020 (Online) 2nd September Morning Slot

Numerical

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The internal energy change (in J) When 90 g of water undergoes complete evaporation at 100^oC is ______.

(Given : $$\Delta $$H_vap for water at 373 K = 41 kJ/mol,
R = 8.314 JK^–1 mol^–1)

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JEE Main 2020 (Online) 9th January Evening Slot

Numerical

-0

A cylinder containing an ideal gas (0.1 mol of 1.0 dm³) is in thermal equilibrium with a large volume of 0.5 molal aqueous solution of ethylene glycol at its freezing point. If the stoppers S₁ and S₂ (as shown in the figure) are suddenly withdrawn, the volume of the gas in litres after equilibrium is achieved will be____.

(Given, K_f (water) = 2.0 K kg mol^–1,
R = 0.08 dm³ atm K^–1 mol^–1)

JEE Main 2020 (Online) 9th January Evening Slot Chemistry - Thermodynamics Question 69 English

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JEE Main 2020 (Online) 9th January Evening Slot

Numerical

-0

A sample of milk splits after 60 min. at 300 K and after 40 min. at 400 K when the population of lactobacillus acidophilus in it doubles. The activa tion energy (in kJ/ mol) for this process is closest to__________.

(Given, R = 8.3 J mol^–1 K^–1, $$\ln \left( {{3 \over 2}} \right) = 0.4$$, e^–3 = 4.0)

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JEE Main 2020 (Online) 8th January Evening Slot

Numerical

-0

NaClO₃ is used, even in spacecrafts, to produce O₂. The daily consumption of pure O₂ by a person is 492L at 1 atm, 300K. How much amount of NaClO₃, in grams, is required to produce O₂ for the daily consumption of a person at 1 atm, 300 K ?
NaClO₃(s) + Fe(s) $$ \to $$ O₂(g) + NaCl(s) + FeO(s)
R = 0.082 L atm mol^–1 K^–1

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