Light energy can be described as nhf, where n is a number of photons, h is Planck\'s constant, and f is the frequency of the light (also denoted by the symbol ν). Calculate the minimum number of photons, n, needed to make the reduction of 2 moles of NADP favorable for light absorbed at 7.00 × 102 nm. Assume that the amount of energy needed for the reduction of one mole of NADP to be favorable must exceed 219 kJ/mol.

Name the element in group 17, period 2. (periodic table)

Problem page combustion of hydrocarbons such as pentane ( c5 h12 ) produces carbon dioxide, a "greenhouse gas." greenhouse gases in the earth's atmosphere can trap the sun's heat, raising the average temperature of the earth. for this reason there has been a great deal of international discussion about whether to regulate the production of carbon dioxide.(a) write a balanced chemical equation, including physical state symbols, for the combustion of liquid pentane into gaseous carbon dioxide and gaseous water. (b) suppose 0.350 kg of pentane are burned in air at a pressure of exactly 1 atm and a temperature of 20.0 degree c. calculate the volume of carbon dioxide gas that is produced. be sure your answer has the correct number of significant digits.

8. what happens to matter during a chemical reaction