We will use this formula for first order: ㏑[A] = - Kt +Ao when we have t (given)= 30 min = 30 x 60 = 1800 s (we here convert time from min to second. then we assume that the initial concentration Ao = 1 and the concentration of A (final concentration = 0.25 So by substitution: ㏑(0.25) = - K * 1800 + ㏑(1) 1.39 = K * 1800 ∴ K = 0.00077 s^-1 or 7.7 x 10^-4
There are 12<span> protons and </span>10<span> electrons in a </span><span>Mg<span>2+</span></span><span> ion, the normal amount of neutrons is </span>12<span>.</span>
Nitrogen fixation is a chemical process by which molecular nitrogen in the air is converted into ammonia or related nitrogenous compounds in soil or aquatic systems. Atmospheric nitrogen is molecular dinitrogen, a relatively nonreactive molecule that is metabolically useless to all but a few microorganisms.
