Answer:
90yrs
Explanation:
Half life is the time taken for half of an original radioactive material to decay by half.
For the sample;
Half - life = 45yrs
Original amount = 600cpm
Start Number of atoms
0yrs 600cpm
First half life
45yrs 300cpm
Second half life
90yrs 150cpm
Answer:
by increasing temperature
10g/ 763g/mol= 0.013moles
It could be a tide pool but this is pretty vague
3NH4OH+AlCl3=Al(OH)3+3NH4Cl