The volume of the unknown solution obtained from the given standard curve is 2.57%
The linear equation produced by the standard curve is :

- y = absorbance ;
- x = concentration in percent (v/v)
Unknown Solution with absorbance value of 0.35 ;
Input the value of y into the equation.

Collect like terms


Divide both sides by 0.136



Hence, percentage by volume of the unknown solution will be 2.57%
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Answer:
an element is a pure substance which can not be spilt into simpler substances by chemical means
Explanation:
examples hydrogen, oxygen, copper
The answer is in the image attached.
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Hello!! The answer should be C because as the higher you go in the food chain, the energy will decrease. Plants and the producers always have the most energy, whereas the tertiary consumers always have the least amount of energy. I hope I helped and gave you the right answer you are looking for. Have a great evening!!