[Win,odd Dhamnekar]

William Prout reported that the density of a certain gas was 2.118 grains per 100 cubic inches at 60°F and a pressure of 30 inches Hg.
1) Express the gas density in units of grams per liter. The following conversion factors may be handy:

1 grain = 0.0648 grams
1 inch = 2.54 cm
Celsius temperature = (5/9)(Fahrenheit temperature - 32)
1 inch Hg = 25.4 torr and 760 torr = 1 atm
2) How many moles of an ideal gas would fill 100 cubic inches at 60°F and a pressure of 30 inches Hg?
3) What is the molar mass of this gas? Make a guess at the identity of the gas.

My answers:
1)0.08375 grams per liter

2)0.06935 moles of an ideal gas would fill 100 cubic inches at 60°F and a pressure of 30 inches Hg.

3)1.979 grams is the molar mass of this gas.

 But i am unable to guess at the identity of this gas?
 Would anyone identify this gas here? 

[AWK]

1. 0.08375 grams per liter at 60°F and a pressure of 30 inches Hg

3.
Try to use the Prout hypothesis.