What do stars spend most of their lifespan as?

Perform the following mathematical operations and report the answer to the appropriate number of significant figures 5.87998 + 3.100

When determining the shape of a molecule, it is important to draw a lewis dot structure first in order to see the total number a. electrons within the moleculeb. bonding and unshared pairs around central atomc. unshared pair within the molecule( i really need it )

How many moles of carbon dioxide will form if 2.5 moles of c3h8 is burned