PLEASE PLEASE PLEAS I NEED HELP!
if the half-life of substance z is 2.5 years, how long would it take dor 48 grams of substance z to decay such that only 3 grams remain?
if you are willing i need help on more questions and ill give you brainliest if you do!!

How do you convert 4 mmol of bromobenzene to ml?

In a heat engine of 1000 j of heat enters the system and the piston does 500 j of work what is the final internal energy of the system if the inital energy was 2000 j we have to do all of these down here 1)write the equation 2)list out your know variables 3)plug the numbers into the equations 4)solve 5)write your solution statemtn that includes inital energuy and final energuy added

Some molecular compounds, such as hcl, ionize completely in solution. for molecular compounds such as h2co3, most molecules do not ionize in solution. which describes the properties of these two solutes? a. hcl and h2co3 have the same effect on the properties of the solution. b. hcl raises the freezing point of water more than h2co3 does. c. hcl raises the boiling point of water more than h2co3 does.