Dorothy Perkins has a great collection of affordable, feminine fashion that is updated daily in store. In sizes that range from 6 to 22, its the perfect place to solve any outfit dilemma.For everything from tops, knitwear, dresses and jeans, to suits and coats, swimwear and even maternity wear, Dorothy Perkins is the best place to get a fast fashion fix.n sizes that range from 6 to 22, its the perfect place to solve any outfit dilemma. For everything from tops, knitwear, dresses and jeans, to suits and coats, swimwear and even maternity wear, Dorothy Perkins is the best place to get a fast fashion fix.
Molar mass nitrogen ( N2 ) = 28.02 g/mol. 1 mol N2 -------> 28.02 g. 4.60 mol ---------> x g. x = 4.60 * 28.02. x = 129 g of N2. hope this helps!.
O2 has molar mass = 16*2 = 32g/mol. Air is essentially a mixture of 80% N2 and 20% O2 plus some CO2 (MM = 44g/mol) and some trace gases. So to sum up: Air must have an average molar mass between 28g/mol and 32g/mol. The accepted average is 29.5g/mol. Nitrogen is therefore lighter than air. Trevor H Â· 7 years ago.