Molecular Physics | Thermodynamics Answers

A heater with a power of 150W is left on for 5 minutes after the water boils. Calculate the mass of water, in unit gram, that has become vapour during the period of 5 minutes.
[Given L of steam = 2260000Jkg-1]

Two persons ordered two cups of hot tea in a cafe while waiting for a third friend. One of them immediately poured tea in his cup and mix cold milk with it. The other person poured tea immediately but mixed cold milk after the friend arrived. Who drinks warmer tea?

When 24.7 cal of heat is added to 18.8 g of aluminum at 22.0 ∘C, what is the final temperature of the aluminum?

When the pressure that a gas exert on a sealed container changes from torr to 456 torr, the temperature changes from 150°GC to 75.0°C ?

In boyle's law,If I increase the temperature of the gas enclosed in a cylinder from 0°C to 25°C in graph between pressure and volume ,which one increase and which decrase

1) What is the rate (in J/(K/s)) at which entropy is generated in the sun by the radiation that intercepts the surface of the Earth? (Both Quantitative and qualitative)

2) What is the entropy generated by the Earth as a result of the absorption of radiation from the sun and the re-radiation into space? (Both Quantitative and qualitative)

3) Hence determine the total rate for the Earth-Sun radiation-absorption-re-radiation system. Given that the Earth is not an isolated system, account for the potential for processes on the Earth that locally decrease entropy?

What structure does the compound caesium iodide crystallise in?

What is the rate

An electric geyser is used to heat 5l of water from 13℃ to 83℃ .If the heat lost in radiatin is 40 kj and water equivalent of geyser is 100 . Determine the efficiency of the geyser . Take specific heat of water as 4200 J/kg.k°.