General Knowledge - Chemistry - Discussion

As according to 'higher the temp. Higher will be speed' then out of all 4 N2 must have higher speed.

I think hydrogen gas is right. The light one will move faster.

The speed of the gaseous molecules is inversely proportionally to their molecular mass. In this case hydrogen satisfy this condition.

CH4 IS THE ANSWER TO THE QUESTION BECAUSE.

Average speed = Square root of (8RT/pi M).

T = Temperature.

Pi = 22/7 or 3.14.

M = molecular mass.

Now since mass is in denominator. It means molecular mass is inversely proportional to average speed. So as mass increases average speed decreases. And as mass decreases average speed increases.

So find out which of the following has lightest molecular mass?

CH4 = 16 g/mole.

Kr = 83.8 g/mole.

N2 = 28 g/mole.

CO2 = 44 g/mole.

Ar = 39.9 g/mole.

Since CH4 has lowest molecular mass among these so it's average speed will be highest.

Lighter mass and high temperature both are taken into account. So answer is A.

Answer A is right.

Because hydrogen is the lightest gas.

Obviously hydrogen is very light gas.

There are two factors weight and temperature.

Root mean square velocity = 3RT/M.

K.E directly prop.to Temperature. So at this point of view C is correct but According to Graham's law Rate of effusion of a gas is inversely proportional to the square root of the molar mass of its particles so H is very small molar mass in Periodic Table 1.006 somehow, and N is 14. So the correct answer is A.

You use the root mean square velocity because the temperature is given and don't blindly consider only the mass of the element.