75 mL of a gas is at 690 mmHg at -45°C. What will be the new volume at
STP? *

56.9 mL

Explanation:

To solve this problem, we can use the equation of state for an ideal gas, which states that:

where

p is the pressure of the gas

V is its volume

n is the number of moles in the gas

R is the gas constant

T is the absolute temperature of the gas

For a gas undergoing a transformation, n and R remain constant, so we can rewrite the equation as:

where in this case:

is the initial pressure of the gas

is the initial volume

is the initial temperature of the gas

is the final pressure (at STP)

is the final temperature (at STP)

Solving for V2, we find the final volume of the gas: