Hydrogen has two naturally occurring isotopes, 1h and 2h. chlorine also has two naturally occurring isotopes, 35cl and 37cl. thus, hydrogen chloride gas consists of four distinct types of molecules: 1h35cl, 1h37cl, 2h35cl, and 2h37cl. place these four molecules in order of decreasing rate of effusion.

Molecules in order of decreasing rate of effusion:

Explanation:

Mass of gas=

Mass of gas =

Mass of gas =

Mass of gas =

According Graham's law:

'The rate of effusion or diffusion of gas is inversely proportional to the square root of the molar mass of the gas'.The equation given by this law follows the equation:

So, higher the molecular mass of the gas lower will be the effusion rate and vice versa.

Increasing order of molecular masses of the given gases:

Decreasing order of effusion rate respective to gases:

Molecules in order of decreasing rate of effusion:

why do the isotopes of a particular element behave differently in nuclear reactions but the same in chemical reactions? chemical reactions involve changes to electrons in an atom; isotopes do not differ in electrons, and so they react the same way during chemical changes.

"standard molar enthalpy:

h2o ( liquid water ) : - 285.8 kj/mole

h2o ( water vapor ) : - 241.8 kj / mole.

δhrxn = - 241. 8 - ( - 285.8 )= -241.8 + 285.8 = 44.0

answer: 44.0 kj"