Well there's a couple reasons why. First, the land itself can become “tired" and less fertile<span>. This is because the same type of </span>crop<span> planted repeatedly in the same area keeps draining the land of the same nutrients needed for that plant's growth. Pest can also plant their nest near the crop if the farmer continues to plant the same crop in the same place.
Which is the reason why things such as "crop rotation" exist to keep things fresh, and prevent what I described above from happening.</span>
Atom enery is also one of them
15.9 grams is the amount of copper sulfate this reaction will produce.
Given:
- The reaction between copper and sulfur:
- 12.7 grams of copper completely reacts with 3.2 grams of sulfur to give copper sulfide.
To find:
The mass of copper sulfide produced
Solution
Mass of copper used by the scientist = 12.7 g
Mass of sulfur used by the scientist = 3.2 g
Mass of copper sulfide this reaction will produce. =?
According to the law of conservation of mass:
Total mass of reactants = Total mass of products
The total mass of reactants in the reaction = R = 12.7 g + 3.2 g = 15.9 g
The total mass of product formed in the reaction = P
P = R = 15.9 g
Mass of copper sulfide this reaction will produce = 15.9 g
15.9 grams is the amount of copper sulfate this reaction will produce.
Learn more about the law of conservation of mass:
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Answer:
[ NaOH ] = 0.026 M
Explanation:
- molarity NaOH = mol NaOH / Vsln(L)
∴ Vsln = 20.46 mL = 0.02046 L
- NaOH(aq) + KHC8H4O4(aq) → KNaC8H4O4(aq) + H2O(l)
∴ Mw KH(KHC8H4O4) = 204.24 g/mol
⇒ mol KHP = 0.1082 g / 204.24 g/mol = 5.298 E-4 mol
⇒ mol NaOH = (5.298 E-4 mol KHP)( mol NaOH/mol KHP)
⇒ mol NaOH = 5.298 E-4 mol
⇒ [ NaOH ] = 5.298 E-4 mol / 0.02046 L
⇒ [ NaOH ] = 0.026 mol/L = 0.026 M