chemistry question

Question

What is the root mean square average speed of of water molecules at 211 degrees Celsius in the gas phase. Can someone please show the steps as well.

Answer 1

Vrms = √(3RT/M)

Vrms = root mean square velocity = ?

R = gas constant = 3.814 J/mol-K

T = temperature in K = 211ºC + 273 = 484K

M = molar mass in kg/mole = 18 g/mole = 0.018 kg/mol

Vrms = √(3)(8.314)(484)/0.018

Vrms = 819 m/sec

Answer 2

HI Brianna

There is an equation for calculating the rms speed of gas molecule (water is a gas at 211C)

Vrms = √(3RT/M), where

R is the Universal Gas Constant -8.3145

T is the temperature in Kelvin

M is the molar mass of the molecule - in this case H2O

Temperature is related to the average speed of molecules in the substance being measured.

Hope this helps

Jim