Abox contains 104 gas molecules, 2500 of nitrogen and 7500 of argon in thermal equilibrium. the molecular weight of n2 is 28g/mol, and of ar is 40g/mol. the total thermal energy of the collection of 104 molecules is 5x10-17j. what is the temperature of this gas

Answer : The temperature of this gas will be, 206.9 K

Explanation :

The expression for the kinetic energy per molecule of monoatomic gas (argon) is:

     ...........(1)

The expression for the kinetic energy per molecule of diatomic gas (nitrogen gas) is:

     .............(2)

The total kinetic energy of the molecule will be,

Now put all the expression in this, we get:

Now put all the given values in this expression, we get:

Therefore, the temperature of this gas will be, 206.9 K

given:

mass of na = 115 g

excess cl2

to determine:

mass of nacl produced

explanation:

given reaction is-

2na(s) + cl2(g) → 2nacl(s)

since cl2 is in excess, na will be the limiting reagent

as per the reaction stoichiometry na: nacl = 1: 1

i.e. moles of na reacted = moles of nacl formed

now, # moles of na = mass of na/atomic mass

                                  = 115 g/23 g.mol-1 = 5 moles

therefore, moles of nacl = 5

molar mass of nacl = 58 g/mol

mass of nacl = 5 moles * 58 g.mol-1 = 290 g

ans: amount of nacl produced = 290 g