Aresearch balloon at ground level contains 12 l of helium (he) at a pressure of 725mmhg and a temperature of 30.00∘c. when the balloon has risen to its highest altitude, the volume increases to 28 l and the pressure decreases to 252 mmhg. what will be the temperature of the gas under these conditions?

The temperature when the volume and pressure has changed is -27.26°C

Explanation:

To calculate the temperature when pressure and volume has changed, we use the equation given by combined gas law. The equation follows:

where,

are the initial pressure, volume and temperature of the gas

are the final pressure, volume and temperature of the gas

We are given:

Putting values in above equation, we get:

Converting this into degree Celsius, we get:

Hence, the temperature when the volume and pressure has changed is -27.26°C

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

it should be all of them because it asks if you included all of those in your answer

explanation: