The gravitational force between a mass and the Earth is the object's weight. Mass is considered a measure of an object's inertia, and its weight is the force exerted on the object in a gravitational field. On the surface of the Earth, the two forces are related by the acceleration due to gravity: Fg = mg.
1: B
2: B
3: A
4: A
5: D
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20 explanation explain what the problem did you say about it
<span>After 3200 years, the amount remaining of the original 900 g is 225/900 = 1/4.
Each half-life is enough time to reduce the amount of a radioactive material by a factor of 2.
1/4 is a reduction by two factors of 2. (1/2 * 1/2 = 1/4)
So 3200 years is two half-lives, so one half-life is 1600 years. </span> Source(s):
The number of moles of O2 that are needed to react with 24 moles of C2H6 is 84 moles of O2
<u><em>Explanation</em></u>
Step 1: write the equation for reaction
= 2C2H6 +7O2 → 4CO2 + 6H2O
Step 2: use the mole ratio to determine the moles of O2
- that is the mole ratio of C2H6 : O2 is 2:7
- therefore the moles of O2= 24 x7/2= 84 moles of O2