Answer : The final pressure of the gas is, 
Explanation :
Boyle's Law : It is defined as the pressure of the gas is inversely proportional to the volume of the gas at constant temperature and number of moles.

or,

where,
= initial pressure = 545 mmHg
= final pressure = ?
= initial volume = 775 mL
= second volume = 171 mL
Now put all the given values in the above equation, we get:


Therefore, the final pressure of the gas is, 
Fluorine has the smallest atomic radius at a 42
Answer:
the answer to this is 74 :)
A. The potential energy from the batteries in the torch is transferred to the filament of the bulb. The energy is transferred to the surroundings as thermal energy and light. Most of the energy is transferred as thermal energy which is not useful and only some of the energy is transferred as light
Answer: C) The mass stays constant as it changed from a liquid to a gas
Explanation: Mass stays constant, it's never destroyed or created. It follows the law of conservation of mass.