Question

calculate the gram molecular mass of chlorine if 308 cm^3 of it at STP weighs 0.979g ?

Answer 1

308 cm3 is 308 ml converting into moles 308/22400=0.0137 now again

0.979/molecular mass =0.0137 = molecular mass =0.979/0.0137=71

Answer 2

Gram molecular mass can be obtained by dividing the mass by number of moles:

308 cc = 0.308 L

Number of moles = 0.308 L * 1 mol / 22.4 L

= 0.013 moles

Therefore Molecular weight:

= 0.979 / 0.013

= 75 g/mol