weather balloon is filled with helium to a volume of 340 L at 30 ∘C and 751 mmHg . The balloon ascends to an altitude where the pressure is 495 mmHg and the temperature is -27 ∘C.What is the volume of the balloon at this altitude?

Thus the volume of the balloon at this altitude is 419 L

Explanation:

Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.

The combined gas equation is,

where,

= initial pressure of gas = 751 mm Hg

= final pressure of gas = 495 mm Hg

= initial volume of gas = 340 L

= final volume of gas = ?

= initial temperature of gas =

= final temperature of gas =

Now put all the given values in the above equation, we get:

Thus the volume of the balloon at this altitude is 419 L

→ Are known as isotopes.

→ 12, 13 and 14 are mass numbers

Explanation:

Isotopes are atoms of the same element with same atomic number but different mass numbers.