6. How many grams are in 3.45 x1022 molecules of Na2CO3? 7. How many moles are in 26.88g of KCI?

8. How many moles are in 0.02345 g of NH4C2H302?

9. How many grams are in 8.64x1025 molecules of KCI?

10. How many moles are in 3.45 g of Pb(Cr2O7) ?

11. How many molecules are in 0.00487 g of KCI?

Match the vocabulary terms to their definitions. 1 . a long, chain-like set of molecules made up of repeating units joined end to end polymer 2 . a hard, brittle, heat- and corrosion-resistant material made by subjecting a nonmetallic mineral mixture to intense heat ceramic 3 . a plastic with low elongations that cannot be recycled thermoset 4 . a carbon fiber embedded in a polymer resin matrix thermoplastic 5 . a plastic with high elongations that can be recycled crystal 6 . a solid form resulting from the arrangement of atoms, ions, or molecules in definite geometric patterns composite