The nearest thousand is 547,000
try this for answer (11×3.5)-9=x
The answer is letteer C. You just have to multiply 9 and pi
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
