Another study at the University of Michigan determined that the overall mean peak reaction force during a typing task is 2.54 Newtons (263.1 grams), which is 5.4 times the minimum key actuation make-force of . 47 Newtons (47.6 grams) (4).
To find moles : moles= Mass (C₄H₂O₄) / RFM (C₄H₂O₄)
so moles = 147.7 / 114 = <span>1.2956mol
hope that helps </span>
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!
Answer:
energy released - excited to ground -An electron absorbs energy and moves to a higher shell (energy level). As the electron returns to a lower shell (energy level), it releases energy in the form of a bright- line spectrum.