INTERPRETING GRAPHICS

WHAT IS THE PERCENT OF CARBON IN 50.0 G OF CYCLOHEXANE?

• 85.7% carbon

CALCULATE THE MASS OF HYDROGEN IN 150.0 g OF ETHENE

• 150gx.143=21 g

WHY IS % COMP ALONE NOT GOOD ENOUGH TO IDENTIFY A COMP

• The percent composition is insufficient because the
• Compounds can have the same percent comp
• But different molecular formulas

Untitled Slide

• WHAT, IN ADDITION TO % COMP, IS NEEDED TO DISTINGUISH C2H4 FROM C6H12
• You need the moles mass along with the percent composition
• To distinguish ethane from cyclohexane because the percent comp is the
• Same for both compounds.

DIBROMOETHANE

WHICH GRAPH REPRESENTS % COMP OF H2SO4

• Acid X
• Which graph represents % comp of H2SO3
• Acid Y