Hi there,

I have 1 question I have done it just wondering some feed back if this is right.

1.Calculate the Density of NaCl at 20C in [lbm/ft3]

here i used the Specific gravity of NaCl and which was 135lbm/ft3 multiply by 62.43lbm/ft3 which is the ref. for most soilds and liquids but this gives a very large density of 8370 lbm/ft3

but i was wondering if this could be done by using the V=nRT/P plug V into the D=M/V => D=m/(RT)

since there is no mention of the weight of NaCl i assumed 1mole

by doing this i get this answer 1.497022809933 lb/ft3 to get lbm/ft3 i just divied 1.49/32.2 =0.0357lbm/ft3

why is there such a difference between these 2 answers

is there a better method of doing this?