Acompound has a molar mass of 90. grams per mole and the empirical formula ch2o. what is the molecular formula of this compound?
(1) ch2o (3) c3h6o3
(2) c2h4o2 (4) c4h8o4

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.

Freezing and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

Identify the lewis base in this balanced equation: fe3+ h2o fe(h2o)63+