Answer:
im guessing 15
Step-by-step explanation:
Answer:
125 minutes total.
Step-by-step explanation:
You do:
25 times 5
= 125 minutes.
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
Answer:
Its B.
Step-by-step explanation:
It said so.
M/7 would be the correct answer