Can someone help me with this i have never been so confused in my lifetime please dont play around im already having a bad day

What is the mass of sodium in 3 moles of sodium chloride

Explain how the integumentary system plays a crucial role in the ability to maintain homeoestasis

Which statement is usually true about the relationship between activation energy and reaction rates? low activation energy barriers result in low rates. high activation energy barriers result in low rates. low activation energy barriers result in no reaction. high activation energy barriers result in no reaction.