Photosystems are the protein molecules that are optimized to harvest light. There are two types of photosystems: photosystem I (PSI) and photosystem II (PSII).
PSI is called P700 and PSII is called P680. It is called P700 because it absorbs the light at around 700 nm wavelength. P680 because it absorbs the light at around 680 nm wavelength.
In non-cyclic photophosphorylation, the photons of light is first transferred to P680, boosting an electron to a high energy level. The high-energy electron is passed to an acceptor molecule and replaced with an electron from water. This splitting of water releases the O2 we breathe.
In cyclic photophosphorylation, the light of wavelength 700 nm is absorbed by P700 and the electrons are the passes to the acceptor molecule by several carriers.
The formula for the molecular formula is molar mass/ empirical formula
So, the empirical formula of C3H7 is equal to C*3 + H*7 which is equal to 12*3 + 7. Then use the molecular formula = 86 / (12*3+7) = 2
Therefore, the molecular formula is 2 times the empirical formula which is C6H14.
<u> Increasing pH will </u><u>increase </u><u>solubility of the </u><u>PbI2</u>
What is equilibrium reaction ?
In a chemical reaction, chemical equilibrium is the state in which both the reactants and products are present in concentrations which have no further tendency to change with time, so that there is no observable change in the properties of the system.
PbI2 + 2OH- (aq) ----> Pb(OH)2(s) + 2I- (aq)
Pb(OH)2 is insoluble therefore increasing pH will lead to the formation of the more solid lead (ll)hydroxide which will help to solubulate more PbI2
therefore equilibrium will shift to right side means increasing pH will increase solubility of the PbI2.
Learn more about equilibrium reaction
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Answer:
(1) 0.035 × 10²³
Explanation:
Step 1: Calculate the mass of Fe in 100 g of Haemoglobin
Haemoglobin contains 0.33% Fe, that is, there are 0.33 g of Fe per 100 grams of Haemoglobin.
100 g Hb × 0.33 g Fe/100 g Hb = 0.33 g Fe
Step 2: Convert 0.33 g of Fe to moles
We will use the molar mass of Fe (55.85 g/mol).
0.33 g × 1 mol/55.85 g = 5.9 × 10⁻³ mol
Step 3: Convert 5.9 × 10⁻³ moles of Fe to atoms
We will use Avogadro's number.
5.9 × 10⁻³ mol × 6.02 × 10²³ atoms/1 mol = 3.5 × 10²¹ atoms (= 0.035 × 10²³)