Assuming simplest formulas (1:1), assign relative masses to elements X and Z if X is 96% by mass and Z is 4.0% by mass.

Drug abuse will not lead to physical and psychological dependence. true or false ?

Draw two cyclic constitutional isomers of cis-1

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?