Calculate the theoretical flame temperature when ethylene at 25°C is burned with: (a) The theoretical amount of air at 25°C. (b) 25% excess air at 25°C. (c) 50% excess air at 25°C. (d) 100% excess air at 25°C. (e) 50% excess air preheated to 500°C. (f) The theoretical amount of pure oxygen. 4.22. What is the standard heat of combustion of each of the following gases at 25°C if the combustion products

I'll do it rn and then answer

Make them both to where they have the denominator of 18that makes 3/2 equal 27/18 and 1/9 equal 2/18so now you have  27/18x+5=2/18subtract 5 from the other sideso now you have 27/18x+2/18-5then subtract 2/18 from 27/18 to get 25/18x=-5then divide 25/18 by -5 and your answer will be  -5/18

Answer: 1.4 seconds which is the third optionexplanation: current is defined as the flow of charge per timetherefore, the equation that relates current, charge and time can be expressed as follows: i = δq / δtwhere: i is the current given = 1.8 ampereδq is the charge given = 2.5 coulombδt is the time required for the flow of the given charges to give the 1.8 ampere.substitute with the givens in the above equation to get the time as follows: 1.8 = 2.5 / δtδt = 2.5 / 1.8 = 1.38888 which is approximately 1.4 secondshope this was !