Hey there!
A half-life means after a certain amount of time, half of that substance will be gone/changed after that time.
60 hours is 4 half lives because 60 ÷ 15 = 4.
So, the 18g sample will be divided in half 4 times.
18 ÷ 2 = 9
9 ÷ 2 = 4.5
4.5 ÷ 2 = 2.25
2.25 ÷ 2 = 1.125
There will he 1.125g of sodium-24 left after 60 hours.
Hope this helps!
<em></em>hydrogen #1 carbon #6 nitrogen #7 oxygen #8 Phosphorus #15 Sulfur #16 Selenium #34
Answer:
Explanation:
2.2 pounds = 1 kg
495 pounds = x
2.2/495 = 1/x Cross multiply
2.2*x = 495 * 1 Divide by 2.2
2.2x/2.2 = 495/2.2
x = 225 kg
Answer:
64
Explanation:
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Answer:
In redox reactions, electrons are transferred from one species to another. If the reaction is spontaneous, energy is released, which can then be used to do useful work. To harness this energy, the reaction must be split into two separate half reactions: the oxidation and reduction reactions.
