# Solutions for Radiactivity Questions

Here are some questions related to Radioactivity with their solutions:

**Question** 1:

8.5J heat flows out into the Surroundings when a sample of a gas contracts 400 mL by an average pressure of 0.5 atm. Calculate the change in energy of the system.

Solution :

Here,

has positive sign. It means energy of the system increases.

**Questions 2:**

10 moles of oxygen is kept in 5.0 L cylinder at 313 K. Due to sudden leakage through a hole, all the gas escapes into the atmosphere and the cylinder gets empty. If the atmospheric pressure is 1.0 atm, calculate the work done by the gas.

Solution : According to gas equation,

PV = nRT nRT

The energy change, for the reaction:

is found to be . Calculate the value of enthalpy change, , at the same temperature.

Solution : For the reaction

According to gas equation,

We know that,

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