Hopkins & Allen has been out of business since 1916. Many of their revolvers were in .32 RIMFIRE Short. This is an obsolete cartridge- once every 10-20 years a manufacturer may produce a limited run of ammo. A few were made in caliber .32 S&W centerfire. Would suggest you have the gun examined by a smith to determine which cartridge, and the safety of the gun (It IS probably over 100 years old). 32 S&W centerfire is a common cartridge- .32 Rimfire is very scarce, and not likely to be found- Sorry.
NO2 is the molecular formula for NO2.
NO2+ is.
NO2 is the chemical formula for nitrous oxide.
NO2- is a base not an acid. It's conjugate acid is HNO2.
Determine the molar mass of NO2 using the subscripts in the formula and the atomic weights in grams from the periodic table. 1 mole NO2 = (1 x 14.0067g N) + (2 x 15.9994g O) = 46.0055g NO2 Calculate the moles NO2 by dividing the given mass by the molar mass. 25.5g NO2 x (1mol NO2/46.0055g NO2) = 0.554mol NO2
No. NO2 Is Nitrogen Dioxide.
NO2 is a conjugate base.
nitrogen dioxide = NO2
Nitrite: NO2-
Ga is Gallium and NO2 is the nitrite anion. Thus, Ga(NO2)3 is gallium nitrite.
Molar mass NO2 = 46.0 g/mole1.18 g NO2 x 1 mol NO2/46.0 g = 0.0257 moles NO2 (to 3 significant figures)
Gun shop, gun show, antique gun forum, or possibly Flayderman's Guide to Antique Firearms.