How does temperature affect the weight of a balloon filled with CO2?

Question

Will increasing the temperature increase pressure (because the molecules move around more), and therefore cause CO2 in a balloon to reduce in volume and reduce in weight? My chemistry book says that an increase in pressure causes a decrease in volume, but I don't know if that applies to balloons, where the volume isn't fixed. This page says the opposite: http://wiki.answers.com/Q/How_does_temperature_and_pressure_affect_gases

Please help! My lab is due tomorrow, and I'm so confused!

Answer 1

Changing the pressure of a fixed amount of molecules will not change the weight. Say you have 1 mol of CO2 in the balloon: it weighs 44 grams. It doesn't matter if you heat it up (change temperature), press it against the ground (change pressure), or spread the molecules apart (change volume). 1 mol of CO2 is always 44 grams. This is known as the conservation of mass.

Answer 2

If a gas is confined in a flexible container like a balloon, first be aware that no matter can enter or leave the container. If the quantity of matter in the container is fixed, then its mass - a measure of the quantity of matter cannot change. The weight of the gas cannot increase or decrease!



Now if temperature increases, just as you stated, collisions increase in both frequency and intensity. This pushes the walls of the balloon outward because the internal pressure inside the balloon exceeds the atmospheric pressure outside of the balloon. The balloon increases in size, reducing the internal pressure, until once again there is equilibrium between inside and outside pressure. If the temperature should decrease, the confined gas contracts decreasing the collisions and therefore the pressure they exert. This upsets the equilibrium between inside and outside pressure and the balloon decreases in volume. The decrease in volume (space inside) increases the pressure. Changes in size stops when pressures are again equal.



The only way that an increase in pressure can cause a decrease in volume is if the external pressure - the pressure on the balloon - increases. The balloon wall will always move in the direction the greater pressure is acting.

Answer 3

Bob is optimal. The flesh presser would have been complicated comments warming (that can ensue over some years) effects with the warming immediately brought about via CO2. as long via fact the extra CO2 keeps to be in the ambience (a hundred and fifty years is a actual looking universal estimate) it rather is going to shop the outdoors temperature warmer and for this reason gasoline the comments tactics. various the on-going comments warming effects would incorporate: a million) decreased albedo as floor ice section is decreased 2) launch of permafrost trapped methane/CO2 3) a hotter ocean is waiting to soak up much less CO2 Sorry, i've got not got a hyperlink off hand that nor time to locate one suitable now.

Answer 4

no mass has not changed

PV=nRT