The amount of chlorophyll a (M, 892) in a spinach leaf is about 20 µg/cm² of leaf. In midday sunlight, the average rate of energy reaching the leaf is 5.4 J/cm². min. Assuming an average photon energy of 270 kJ/einstein and that the leaf absorbs 50.0% of the radiation, calculate the rate of light absorption by the photons in units of einstein/cm²-min. Number rate = 1.6× 10¹4 24 Calculate the amount of time, in seconds, that it takes for a single chlorophyll molecule to absorb a photon. The molar mass of chlorophyll is 892 g/mol. Number time = 0 einstein/cm² - min Given that the average lifetime of an excited chlorophyll molecule in vivo is 1 ns, calculate the fraction of the chlorophyll molecules that are excited at any one time. Enter the fraction as a decimal. fraction= Number

What is the wavelength of a 6.76 x 1012 /s wave? Sorry im just really stuck on this question, Please dont leave any minor detail in the question, And also may u step by step this equation.

Example The standard half electrode potential for Fe²+ vs SHE is 0.77 V. What is the value of Ee at T = 298K when: [Fe³+] = 0.2 mol l-1 [Fe2+] = 0.05 mol 1-1

AG°xn=-28.6 kJ Given the following equation, H2O(g) + CO(g) → H2(g) + CO2(g) Calculate AG°n for the following reaction. -> 8 H2O(g) + 8 CO(g) 8H2(g) + 8 CO2(g) a -71.5 kJ b -3.57 kJ C +3.57 kJ d +228.8 kJ e -228.8 kJ O O O O O

(please type answer not write by hend)

The distribution of Na* ions across a typical biological membrane is 10 mmol/dm3 inside the cell, and 140 mmol/dm³ outside the cell. At equilibrium, the concentrations across the membrane are equal. What is the Gibbs energy difference across the membrane at 37°C? The stated difference in concentration MUST be maintained by coupling to reactions that have at least your calculated difference of Gibbs energy. Ans: 6.8 kJ/mol

What is the frequency of green light that has a wavelength of 531 nm? (c = 3.00 x 10⁸ m/s)

A coal fire plant uses 1 kg of coal to generate 1000 kWh of electricity and emits 50 kg of CO2 and 5 kg of SO2 per day. (1) If the functional unit is 1 kWh of electricity, please relate the emissions to FU. (2) What are the emissions for a plant generating 2000 kWh of electricity? (3) What if the functional unit is 1000 kWh? (4) What if the functional unit is 1000 MJ of energy? (5) What is the functional unit is 1kg of coal?

Using the information shown  in the image and the structural details of the K+ channel, answer and explain the following: A. Calculate the ratio (F1/F2) of the electrostatic force (F1) produced by the interaction between a K+cation and one O atom of a carbonyl in the selectivity filter, and the force (F2) between a Na+ cation and one O atom of a carbonyl in the selectivity filter. Use this ratio to explain why the channel is selective for K+ relative to Na+?

A research group discovers a new version of happyase, which they call happyase*, that catalyzes the chemical reaction: HAPPY-SAD The researchers begin to characterize the enzyme. The researchers determined the kcat of the enzyme to be 452 s-1. In a separate experiment with [E;) at 1.5 nM and [HAPPY) at 38 µM, the researchers find that Vo is equal to 320 nM s-1. What is the measured Km of happyase* for its substrate HAPPY? Make sure to include units in the answer.