14. Calculate the percent nitrogen in Cu(NO3)2. Round your answer to the closest whole number. *Don't Forget Your Units!! (1 Point) Enter your answer 15.How many of the following chemical formulas represent Empirical Formulas?
H20
P5010
H2SO4
Na20
C3H8 (1 Point)

Ineed with this also i hope you understand it

The population of unionid mussels decreased after zebra mussels were introduced. zebra mussels competed with the unionid mussels for food. the zebra mussels were able to displace the unionid mussels, allowing the zebra mussel population to increase  over the years. the unionid mussel population decreased because  of lack of food.

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Polyethylene is a strong synthetic polymer that can be used to make toys and bottles. this makes plastics which are important also to people but sometimes it lead to harmful environmental effects such as global warming if these plastics are burned.