Find the number of moles in a 28.0g sample of NH3.

PLS URGENTLY

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

The material that keeps its new shape after it is stretched is called?

Because air contracts as it cools, the air pressure inside a freezer is typically lower than on the outside. why do ice cubes inside a freezer tend to shrink over time? a. the ice dissolves oxygen from the air, forming a denser crystalline matrix.b. the ice reacts chemically with carbon dioxide in the air, forming gaseous carbon compounds.c. the ice melts, and then the liquid freezes as ice crystals on the bottom of the freezer.d. the ice sublimes, and then the water vapor deposits as ice crystals on the sides of the freezer.