Ahelium balloon with a volume of 550ml is cooled from 305 to 265k. the pressure on the gas is reduced from 0.45 atm to 0.25 atm. what is the volume of the gas at the lower temperature and pressure

860 mL.

Separate this process into two steps:

What would be the volume of the balloon after each step?

After Cooling the balloon at constant pressure:

By Charles's Law, the volume of a gas is directly related to its temperature in degrees Kelvins.

In other words,

,

where

Rearranging,

.

The balloon ended up with a lower temperature. As a result, its volume drops: .

After reducing the pressure on the balloon at constant temperature:

By Boyle's Law, the volume of a gas is inversely proportional to the pressure on this gas.

In other words,

,

where

Rearranging,

.

There's now less pressure on the balloon. As a result, the balloon will gain in volume: .

The final volume of the balloon will be .

- lead + phosphoric acid = hydrogen + lead(ii) phosphate

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.