Answer:
Amount of Niobium-91 initially
= 300/91 =3.2967mol
2040 years = 3 ×680 = 3 half-lives
therefore, amount left = 0.4121mol
mass of Niobium-91 remaining = 0.4121 ×91 =37.5g
Please give brainliest
Pretty sure that you got it right..
Step-by-step explanation:
Solve for b^2.




what Answer:
what about like something you could both enjoy together like a tent. or a camping kit like survival type stuff. if your dad's into that.
Step-by-step explanation: