An unknown gas occupies a volume of 4.75 l at 1227 "cand 5.00 atm. if the mass is 5.45 g what is the molar mass of the gas? (r=0.0821 atml/molk) a) 23.8 g/mol b) 344 g/mol c) 215 g/mol d) 28.3 g/mol e) 141 g/mol

Answer : The correct option is, (D) 28.3 g/mole

Explanation :

Using ideal gas equation :

where,

P = pressure of gas = 5.00 atm

V = volume of gas = 4.75 L

T = temperature of gas =

n = number of moles of gas

w = mass of gas = 5.45 g

M = molar mass of gas = ?

R = gas constant = 0.0821 L.atm/mol.K

Now put all the given values in the ideal gas equation, we get:

Therefore, the molar mass of the gas is 28.3 g/mole

the answer is barium and copper bromide