<span>(2) butynu........................</span>
Answer:
The total heat required is 4088.6 J
Explanation:
We have three processes which involve heat absorption. We have to calculate the heat of each process and then to calculate the total heat.
1- liquid ethanol is heated from 25ºC (298 K) to the boiling point 78.5ºc (351.5 K). We use specifi heat of liquid ethanol to calculate the heat absorbed in this part:
H1= m x Sh x ΔT
H1= m x Sh x (Tfinal - Tinitial)
H1= 3.95 g x 2.45 J/g.K x (351.5 K -298 K)
H1= 517.7 J
2- State change: liquid ethanol is vaporized it turns gaseous ethanol The process occur at constant temperature (78.5ºC= 351.5 K). We need the molecular weight of ethanol (2 x 14 + 5 + 16 + 1= 46 g/mol) to cancel mol unit:
H2= m x ΔHvap x 1/Mw
H2= 3.95 g x 40.5 KJ/mol x 1 mol/46 g
H2= 3.477 KJ= 3477 J
3- Gaseous ethanol is heated from 78.5ºC to a final temperature of 95ºC (368 K). We use the specific heat of gaseous ethanol:
H3= m x Sh x ΔT
H3= 3.95 g x 1.43 J/g.K x (368 K - 351.5 K)
H3= 93.2 J
The total heat required is calculated as follows:
Htotal= H1 + H2 + H3
Htotal= 517.7 J + 3477.7 J + 93.2 J
Htotal= 4088.6 J
Answer:
Explanation:
We are given that
Distance between two tiny particles=d=1mm=
Force,F=5 N
We have to find the magnitude of the charge on each of these particles.
Let charge on each particle=q
By Coulomb's law of force
Where
Substitute the values
We are told we have a 14% w/v solution, where w/v is weight/volume. We are asked to prepare 1 L of a 1:4000 solution which can also be written as (1/4000) x 100% = 0.025% w/v solution.
The formula needed here is C1V1 = C2V2 where C1 is the initial concentration, V1 is the initial volume, C2 is the new concentration, and V2 is the new volume.
C1 = 14%
C2 = 0.025 %
V2 = 1 L = 1000 mL
V1 = ?
We must solve for the initial volume V1, which will tell us how much of the initial solution to use.
(14)(V1) = (0.025)(1000 mL)
V1 = 25/14
V1 = 1.8 mL
We will require 1.8 mL of the initial 14% w/v topical antiseptic solution to prepare 1L of a 0.025% w/v solution.
Nuclear fission is the process of which a large nucleus splits into two smaller nuclei with the release of energy and neutron. In simpler words, nuclear fission is the process in which a nucleus is split into two smaller fragments or pieces (nuclei) and so energy and neutrons are released. The resulting pieces of this fission process have less combined mass than the original piece (nucleus) and the missing was is converted into nuclear energy.