The distance that light travels in one year is approximately 9,460,000,000,000 kilometers. In scientific notation, this would be
2 answers:
Explanation:
A mathematical expression that is used for the representation of a decimal number between 1 to 10 raised to the power of 10. As a result, a scientific notation will be written using less digits.
For example, 9,460,000,000,000 kilometers can be written is scientific notation as follows.
km
So, when we remove the decimal then we get the number which is equal to 9,460,000,000,000.
Therefore, we can conclude that the scientific notation of 9,460,000,000,000 km is km.
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Answer:
159 mg caffeine is being extracted in 60 mL dichloromethane
Explanation:
Given that:
mass of caffeine in 100 mL of water = 600 mg
Volume of the water = 100 mL
Partition co-efficient (K) = 4.6
mass of caffeine extracted = ??? (unknown)
The portion of the DCM = 60 mL
Partial co-efficient (K) =
where; solubility of compound in the organic solvent and
= solubility in aqueous water.
So; we can represent our data as:
÷
Since one part of the portion is A and the other part is B
A+B = 60 mL
A+B = 0.60
A= 0.60 - B
4.6= ÷
4.6 =
4.6 × =
4.6 B = 0.6 - B
2.76 B = 0.6 - B
2.76 + B = 0.6
3.76 B = 0.6
B =
B = 0.159 g
B = 159 mg
∴ 159 mg caffeine is being extracted from the 100 mL of water containing 600 mg of caffeine with one portion of in 60 mL dichloromethane.