Use the graph below to calculate the relative humidity if the water vapor density at 25 ᵒC is 0.5 mol/1000L. 0.5/1.3 x 100
1.3/0.5 x 100
25/1.3 x 100
1.3 /25 x 100

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.

i'm pretty sure its b i might be wrong though!

let that person have a turn to speak : )