How do I do these types of problems?? 1) what is M?
2) what is Q?
3) what is J?
4) what is C?
5) what is L?

Chlorophyll a had the molecular formula c55h72mgn4o5 how many atoms are in this molecule

How many moles are in 123.0 grams of kclo4?

According to the passage, which of these is true about gray water systems? a) gray water systems use plants that require less water. eliminate b) gray water systems require the use of less fossil fuels. c) gray water systems reduce the amount of fresh water used. d) gray water systems reduce the amount water used by shower heads.