Which one of these is an element?
a. air
b. water
c. oxygen
d. sodium chloride

How many moles of no2 will form when 3.3 moles of cu are reacted with excess hno3?

What is the volume of 2.5 moles of nitrogen gas (n2)at standard temperature and pressure (stp)?

8. how much enthalpy/heat is transferred when 0.5113gof ammonia (nh3) reacts with excess oxygen according| to the following equation: 4nh3 +502 - 4n0+ 6h20ah = -905.4j