Q.1 ) A sample of unknown organic compound contains C. H. O and N. Combustion of 2.18g sample in excess ess oxygen yields 3.94 g CO , and 1.89 g of H , 0. A separate experiment shows that 1.23 g unknown sample contains 0.235 g nitrogen . What is the empirical formula of the compound ?

The identities of substances are the same before and after which type of change

Which of these statements best explains why space exploration should be encouraged? it prepares humans to live without oxygen. it dispel myths about objects in space. it prevents comets and asteroids from striking earth. it creates technology to absorb harmful radiations in space.

Witch two conditions can limit the usefulness of the kinetic molecular theory in describing gas behavior?