Hey there!
A half-life means after a certain amount of time, half of that substance will gave decayed after that time.
So, we divide the 120 atom sample in half 3 times.
120 ÷ 2 = 60
60 ÷ 2 = 30
30 ÷ 2 = 15
There will be 15 atoms of the radioactive sample remaining after three half lives.
Hope this helps!
The amount left after 1 half life = 16*1/2 = 8 g Then after each half life the amount of x will be 4 , 2 ,1 , 1/2, 1/4 grams
That's a total of 6 half-lives. Answer
Age s rock = 6*220,000 = 1,320,000 years Answer
Answer: A dune is a mound of sand formed by the wind, usually along the beach or in a desert. Dunes can also be formed by strong currents beneath the water.
Answer:
molar ratio= 4:3
since al moles needed so we will leave al in moles and convert o into grams
4: since 1 mole of oxygen is 16g so 3 moles is 48
4:48
put given data
x:90
90*4/48
7.5 moles
Explanation:
To calculate for the number of grams of the solute in the solution, we need to have data in the molar mass of the solute. We calculate as follows:
Number of moles of solute: 0.159 mol KOH / L (.500 L) = 0.0795 mol KOH
Mass: 0.0795 mol KOH (56.11 g / mol ) = 4.46 g KOH
Have a nice day.