Use charles law to solve

Question

 

 A balloon initially at 520mL and at 25.0 degrees Celsius is heated to a final temperature of 75.0 degrees Celsius. What is the final volume assuming the pressure remains constant.

Answer 1

Charles' Law: V₁/T₁=V₂T₂ 

Your volume can be in mL or L (as long as V₁ and V₂ have the same units) but your temperature MUST be in Kelvin

°C +273.15).

 

First, write down what we know:

 

V₁= 520 mL

T₁=25.0 °C=298.15 K

T₂=75.0 °C=348.15

 

Solve for V_2:

 

V₂=(V₁T₂)/T₁ = (520 mL x 348.15 K)/298.15 K ≅ 602 mL

Answer 2

April,

You're posting an awful lot of questions today. Big test review?

Charles' Law indicates that the volume a gas takes up is proportional to the temperature ****in degrees Kelvin****.

Therefore, calculate what your initial and final temperatures are in degrees K (add 273.15 to the degrees C numbers). Then, keeping in mind that when you HEAT a gas it takes up MORE volume: that "MORE VOLUME" is in direct proportion to the ratio of the temperatures. Thus, when you multiply your initial volume by a ratio of the temperatures which temperature do you think goes in the numerator, and which in the denominator?

Your answer should have a zero, a seven, and one other number in it (when properly rounded!) and the units: mL