Answer:
Doggy
Explanation: Its more exotic :)
Approximately 687 days!
Just roughly over 2 years.
Have a nice night....
~Brooke❤️
Answer is: <span>the size of the sample of uranium-238 does not affect its half-life.
</span><span>
The half-life for the
radioactive decay of U-238 is 4.5 billion years and is independent of initial
concentration (size of the sample).
</span>Half-life <span>is
the time required for a quantity (in this example number
of radioactive uranium) to reduce to half its initial
value.</span><span>
</span>
Answer:
The mass of 3.5 moles of Ca is 140 g to two significant figures
