<h3>
Answer:</h3>
4.227 × 10^-19 Joules
<h3>
Explanation:</h3>
Energy of a photon of light is calculated by the formula;
E = hf, where h is the plank's constant, 6.626 × 10^-34 J-s and f is the frequency.
But, f = c/λ
Where, c is the speed of light (2.998 × 10⁸ m/s), and λ is the wavelength.
Given the wavelength is 470 nm or 4.7 × 10^-7 m
Therefore;
E = hc/λ
= (6.626 × 10^-34 J-s × 2.998 × 10^8 m/s) ÷ 4.7 × 10^-7 m
= 4.227 × 10^-19 Joules
Therefore, the energy of a photon with 470 nm is 4.227 × 10^-19 Joules
This is an incomplete question, here is a complete question.
According to the EPA, the maximum contaminant level (MCL) of antimony in drinking water is 0.0060 mg/L.
Convert the MCL of antimony from milligrams per liter to parts per billion (ppb).
Answer : The maximum contaminant level (MCL) of antimony in drinking water in parts per billion is, 6 ppb
Explanation :
ppb : It is defined as the mass of solute present in per 1000 million 
of total mass.
1 ppb = 
As we know that:
1 milligrams per liter = 1000 parts per billion
or,
1 mg/L = 1000 ppb
As, 1 mg/L = 1000 ppb
So, 0.0060 mg/L = 
= 6 ppb
Thus, the maximum contaminant level (MCL) of antimony in drinking water in parts per billion is, 6 ppb
This helps to lower the temperature of the system so that the vapours produced during the reaction can be distilled in liquid form and can easily be collected.
Entropy describes the randomness of molecules.
This is heated until evaporation occurs and sugar crystals are precipitated. This is similar to how chemical sedimentary rocks are formed (like rock salt or cave limestone). It is then separated into small individual crystals. This can be representative of weathering and erosion of rock into sediment
