An ammonia/ammonium buffer solution contains 0.33 M M NH3 N H 3 and 0.65 M M NH4+ N H 4 + . The Kb K b value of ammonia is 1.8×10−5 1.8 × 10 − 5 . Calculate the pH p H of this buffer.

The volume of helium in a blimp is 6.28 x 10^9 millimeters. the density of helium in the blimp is .1786 kilogram/meter^3. find the mass of the helium in the blimp.

Draw any one of the skeletal structures of a 2° alkyl bromide having the molecular formula of c6h13br and two stereogenic centers. indicate chirality by using wedge and hashed wedge notation. lone pairs do not need to be shown.

Correct relationship between molecular formula and empirical formula